How to check that a matlab.ui.Figure handle is deleted?

There is a waitbar() in my application that shows the progress of a simulation. When an error in the simulation occurs, or when I debug the application, the waitbar windows stay on screen and I have to delete them manually.

I installed a cleanup with

fwaitbar = waitbar(0,'Running simulation of '+toml(cname)+'...');
cleanup  = onCleanup(@()killwaitbar(fwaitbar));
...   
function killwaitbar(f)
close(f);
end

However, in case there in no error, MATLAB still runs killwaitbar(), and I get the error

Error using close
Invalid figure handle.
Error in R_nests>killwaitbar (line 431)
  close(f);
Error in R_nests>@()killwaitbar(fwaitbar) (line 73)
   cleanup  = onCleanup(@()killwaitbar(fwaitbar));
Error in onCleanup/delete (line 25)
            obj.task();
Error in R_nests (line 153)
end 
In workspace belonging to R_nests>killwaitbar (line 431)

How can I test for this in the callback? 'f' is of class matlab.ui.Figure, but isa(f,'matlab.ui.Figure') does not say anything about being deleted.

I am sure there is better way to do this but can't find it.

Answer 1

[Walter Roberson]

There is more than one way

fwaitbar = waitbar(0,'Running simulation of');

isvalid(fwaitbar)

ans = logical
   1

isgraphics(fwaitbar)

ans = logical
   1

close(fwaitbar)

isvalid(fwaitbar)

ans = logical
   0

isgraphics(fwaitbar)

ans = logical
   0

[marcel hendrix]

Both methods work for me. I have chosen isgraphics() as isvalid() suggests it needs Stateflow.

[Walter Roberson]

isvalid is defined for handle classes, not just for Stateflow

https://www.mathworks.com/help/releases/R2023b/matlab/ref/handle.isvalid.html

[marcel hendrix]

Not in R2023b (which I prefer at the moment to avoid AI cruft).

[Steven Lord]

What leads you to believe that the isvalid method for handle objects requires Stateflow in release R2023b? There is an isvalid method for a certain type of Stateflow message object, but if you call isvalid on a Handle Graphics handle that's not the method that will be called. This method is and that's part of MATLAB proper.

Sometimes the same name can be used for different purposes by different classes, like for the plot function (which is overloaded a decent amount.)

which -all plot

built-in (/MATLAB/toolbox/matlab/graphics/graphics/graph2d/plot)
/MATLAB/toolbox/matlab/timeseries/@timeseries/plot.m                         % timeseries method
/MATLAB/toolbox/matlab/bigdata/@tall/plot.m                                  % tall method
/MATLAB/toolbox/matlab/graphics/math/@graph/plot.m                           % graph method
/MATLAB/toolbox/matlab/graphics/math/@alphaShape/plot.m                      % alphaShape method
/MATLAB/toolbox/matlab/graphics/math/@polyshape/plot.m                       % polyshape method
/MATLAB/toolbox/matlab/graphics/math/@digraph/plot.m                         % digraph method
/MATLAB/toolbox/bioinfo/bioinfo/@phytree/plot.m                              % phytree method
/MATLAB/toolbox/bioinfo/bioinfo/microarray/@HeatMap/plot.m                   % HeatMap method
/MATLAB/toolbox/bioinfo/bioinfo/microarray/@clustergram/plot.m               % clustergram method
/MATLAB/toolbox/curvefit/curvefit/@cfit/plot.m                               % cfit method
/MATLAB/toolbox/curvefit/curvefit/@sfit/plot.m                               % sfit method
/MATLAB/toolbox/econ/econ/@empiricalblm/plot.m                               % empiricalblm method
/MATLAB/toolbox/econ/econ/@customblm/plot.m                                  % customblm method
/MATLAB/toolbox/econ/econ/@blm/plot.m                                        % blm method
/MATLAB/toolbox/econ/econ/@lassoblm/plot.m                                   % lassoblm method
/MATLAB/toolbox/econ/econ/@mixconjugateblm/plot.m                            % mixconjugateblm method
/MATLAB/toolbox/econ/econ/@conjugateblm/plot.m                               % conjugateblm method
/MATLAB/toolbox/econ/econ/@diffuseblm/plot.m                                 % diffuseblm method
/MATLAB/toolbox/econ/econ/@mixsemiconjugateblm/plot.m                        % mixsemiconjugateblm method
/MATLAB/toolbox/econ/econ/@semiconjugateblm/plot.m                           % semiconjugateblm method
/MATLAB/toolbox/ident/ident/@iddata/plot.m                                   % iddata method
/MATLAB/toolbox/ident/nlident/@idnlarx/plot.m                                % idnlarx method
/MATLAB/toolbox/ident/nlident/@idnlhw/plot.m                                 % idnlhw method
/MATLAB/toolbox/mbc/mbcdata/@cgrules/plot.m                                  % cgrules method
/MATLAB/toolbox/mbc/mbcmodels/@localavfit/plot.m                             % localavfit method
/MATLAB/toolbox/mbc/mbcmodels/@localmod/plot.m                               % localmod method
/MATLAB/toolbox/mbc/mbcmodels/@localmulti/plot.m                             % localmulti method
/MATLAB/toolbox/mbc/mbcmodels/@xregtwostage/plot.m                           % xregtwostage method
/MATLAB/toolbox/mbc/mbcmodels/@xregtransient/plot.m                          % xregtransient method
/MATLAB/toolbox/mbc/mbcmodels/@xregmodel/plot.m                              % xregmodel method
/MATLAB/toolbox/mbc/mbctools/@sweepset/plot.m                                % sweepset method
/MATLAB/toolbox/mbc/mbcview/@cgdatasetnode/plot.m                            % cgdatasetnode method
/MATLAB/toolbox/mpc/mpc/@mpc/plot.m                                          % mpc method
/MATLAB/toolbox/risk/risk/@esbacktest/plot.m                                 % esbacktest method
/MATLAB/toolbox/risk/risk/@varbacktest/plot.m                                % varbacktest method
/MATLAB/toolbox/robust/rctobsolete/robust/@frd/plot.m                        % frd method
/MATLAB/toolbox/robust/robust/@umargin/plot.m                                % umargin method
/MATLAB/toolbox/shared/channel/rfprop/@propagationData/plot.m                % propagationData method
/MATLAB/toolbox/shared/drivingscenario/@drivingScenario/plot.m               % drivingScenario method
/MATLAB/toolbox/shared/msblks_measurement/eyefunctions/@eyeDiagramSI/plot.p  % eyeDiagramSI method
/MATLAB/toolbox/shared/msblks_measurement/eyefunctions/@eyeContour/plot.p    % eyeContour method
/MATLAB/toolbox/shared/msblks_measurement/eyefunctions/@eyeMask/plot.p       % eyeMask method
/MATLAB/toolbox/stats/bayesoptim/@BayesianOptimization/plot.m                % BayesianOptimization method
/MATLAB/toolbox/stats/classreg/@LinearModel/plot.m                           % LinearModel method
/MATLAB/toolbox/wavelet/core/wavelet/@dtree/plot.m                           % dtree method
/MATLAB/toolbox/wavelet/core/wavelet/@ntree/plot.m                           % ntree method
/MATLAB/toolbox/wavelet/core/wavelet/@wdectree/plot.m                        % wdectree method

If you want to check which method would be called for a specific set of inputs, you can call which with the command that you would run as input.

x = 1:10;
which plot(x) % no object involved, so it would call the built-in

built-in (/MATLAB/toolbox/matlab/graphics/graphics/graph2d/plot)

g = graph;
which plot(g) % would call the graph method not the built-in

/MATLAB/toolbox/matlab/graphics/math/@graph/plot.m  % graph method

For figure objects, the isvalid that gets called is a built-in method of the Figure class (which I believe it gets through inheriting from the handle class.)

f = figure;
which isvalid(f)

isvalid is a built-in method  % matlab.ui.Figure method

[Walter Roberson]

@marcel hendrix

I included the direct link to the documentation for the R2023b handle class method isvalid(), not the link to the latest documentation.

[marcel hendrix]

@Steven Lord

> What leads you to believe that the isvalid method for handle objects requires Stateflow in release R2023b?

Well, when I type 'help isvalid' at the commandline MATLAB says:

» help isvalid
--- help for Stateflow operator isvalid ---
    
    isvalid - Determine if message is valid
        isvalid(message_name) checks if an input or local message is valid.
        
        Syntax
        isvalid(message_name)
        
        See also discard, forward, receive
        
        Introduced in Stateflow in R2015b
        Documentation for isvalid
        doc isvalid

To this casual user that means isvalid is for Stateflow messages, not for figure handles or callback parameters. There is nothing in the text that suggests a broader use. When I opened the R2023b doc, the example is again for Stateflow. Given the alternative, I decided to use isgraphics().

[Walter Roberson]

It would be interesting to see

which -all isvalid

isvalid is a built-in method                                   % matlab.metadata.NamespaceList method
isvalid is a built-in method                                   % handle method
isvalid is a built-in method                                   % matlab.metadata.ClassList method
isvalid is a built-in method                                   % matlab.metadata.FunctionList method
isvalid is a built-in method                                   % matlab.metadata.TypeList method
isvalid is a built-in method                                   % matlab.metadata.EnumerationMember method
isvalid is a built-in method                                   % matlab.metadata.MetaData method
isvalid is a built-in method                                   % timer method
isvalid is a built-in method                                   % matlab.lang.internal.ir_workspace_ownership_proxy method
isvalid is a built-in method                                   % matlab.internal.i18n.locale method
isvalid is a built-in method                                   % connector.internal.Worker method
isvalid is a built-in method                                   % RandStream method
isvalid is a built-in method                                   % connector.internal.Logger method
isvalid is a built-in method                                   % matlab.metadata.Namespace method
isvalid is a built-in method                                   % connector.internal.Future method
isvalid is a built-in method                                   % connector.internal.Promise method
isvalid is a built-in method                                   % matlab.metadata.Class method
isvalid is a built-in method                                   % message.internal.MessageService method
isvalid is a built-in method                                   % matlab.internal.WeakHandle method
isvalid is a built-in method                                   % containers.Map method
isvalid is a built-in method                                   % matlab.lang.internal.nested_function_handle_ownership_proxy method
isvalid is a built-in method                                   % matlab.lang.internal.anonymous_function_handle_workspace_ownership_proxy method
isvalid is a built-in method                                   % inputParser method
isvalid is a built-in method                                   % matlab.mixin.Copyable method
isvalid is a built-in method                                   % message.internal.Subscription method
isvalid is a built-in method                                   % matlab.ui.internal.mixin.Printable method
isvalid is a built-in method                                   % matlab.ui.internal.mixin.Windowable method
isvalid is a built-in method                                   % matlab.ui.eventdata.WindowCloseRequestData method
isvalid is a built-in method                                   % matlab.ui.Figure method
isvalid is a built-in method                                   % matlab.ui.internal.mixin.AutoResizable method
isvalid is a built-in method                                   % matlab.ui.internal.mixin.AxesLimits method
isvalid is a built-in method                                   % matlab.ui.internal.mixin.Legacy method
isvalid is a built-in method                                   % matlab.ui.internal.mixin.FontRenderable method
isvalid is a built-in method                                   % matlab.ui.internal.mixin.KeyInvokable method
isvalid is a built-in method                                   % matlab.ui.internal.mixin.NoMarginsUnitsOnlyPositionable method
isvalid is a built-in method                                   % matlab.ui.internal.mixin.Positionable method
isvalid is a built-in method                                   % matlab.ui.internal.mixin.Selectable method
isvalid is a built-in method                                   % matlab.ui.internal.mixin.Scrollable method
isvalid is a built-in method                                   % matlab.ui.internal.mixin.CanvasHostMixin method
isvalid is a built-in method                                   % matlab.ui.internal.mixin.TerminalStateRepresentable method
isvalid is a built-in method                                   % matlab.ui.Root method
isvalid is a built-in method                                   % matlab.ui.control.ClientComponent method
isvalid is a built-in method                                   % matlab.ui.control.Component method
isvalid is a built-in method                                   % matlab.ui.container.Container method
isvalid is a built-in method                                   % matlab.ui.container.CanvasContainer method
isvalid is a built-in method                                   % matlab.ui.control.WebComponent method
isvalid is a built-in method                                   % matlab.ui.control.UIControl method
isvalid is a built-in method                                   % matlab.ui.container.ContextMenu method
isvalid is a built-in method                                   % matlab.ui.container.Menu method
isvalid is a built-in method                                   % matlab.ui.container.toolbar.PushTool method
isvalid is a built-in method                                   % matlab.ui.container.toolbar.ToggleTool method
isvalid is a built-in method                                   % matlab.ui.internal.mixin.UIToggleToolMixin method
isvalid is a built-in method                                   % matlab.ui.internal.mixin.UIToolMixin method
isvalid is a built-in method                                   % matlab.ui.container.Toolbar method
isvalid is a built-in method                                   % matlab.ui.internal.UnitsService method
isvalid is a built-in method                                   % matlab.ui.internal.UnitsServiceStorageInterface method
isvalid is a built-in method                                   % matlab.ui.internal.UnitsServiceStorage method
isvalid is a built-in method                                   % matlab.graphics.mixin.CurrentAxes method
isvalid is a built-in method                                   % matlab.graphics.mixin.Focusable method
isvalid is a built-in method                                   % matlab.graphics.internal.GraphicsUIProperties method
isvalid is a built-in method                                   % matlab.graphics.internal.GraphicsCoreProperties method
isvalid is a built-in method                                   % matlab.graphics.mixin.GraphicsPickable method
isvalid is a built-in method                                   % matlab.graphics.mixin.Layoutable method
isvalid is a built-in method                                   % matlab.graphics.mixin.ViewPropertiesManager method
isvalid is a built-in method                                   % matlab.graphics.internal.Legacy method
isvalid is a built-in method                                   % matlab.graphics.mixin.Mixin method
isvalid is a built-in method                                   % matlab.graphics.mixin.NodeParent method
isvalid is a built-in method                                   % matlab.graphics.eventdata.ChildData method
isvalid is a built-in method                                   % matlab.graphics.mixin.NodeChildren method
isvalid is a built-in method                                   % matlab.graphics.mixin.Pickable method
isvalid is a built-in method                                   % matlab.graphics.mixin.Selectable method
isvalid is a built-in method                                   % matlab.graphics.mixin.Themeable method
isvalid is a built-in method                                   % matlab.graphics.mixin.ThemeContainer method
isvalid is a built-in method                                   % matlab.graphics.internal.GraphicsJavaVisible method
isvalid is a built-in method                                   % matlab.graphics.internal.GraphicsBaseFunctions method
isvalid is a built-in method                                   % matlab.graphics.Graphics method
isvalid is a built-in method                                   % matlab.graphics.GraphicsPlaceholder method
isvalid is a built-in method                                   % matlab.graphics.mixin.internal.Copyable method
isvalid is a built-in method                                   % matlab.graphics.internal.GraphicsPropertyHandler method
isvalid is a built-in method                                   % matlab.graphics.internal.ReferenceObject method
isvalid is a built-in method                                   % matlab.graphics.internal.GraphicsMetaProperty method
isvalid is a built-in method                                   % matlab.graphics.internal.GraphicsMetaEvent method
isvalid is a built-in method                                   % matlab.graphics.internal.GraphicsMetaClass method
isvalid is a built-in method                                   % matlab.graphics.internal.Exportable method
isvalid is a built-in method                                   % matlab.mixin.SetGet method
isvalid is a built-in method                                   % hgsetget method
isvalid is a built-in method                                   % dynamicprops method
isvalid is a built-in method                                   % matlab.metadata.Property method
isvalid is a built-in method                                   % matlab.metadata.Event method
isvalid is a built-in method                                   % matlab.mixin.internal.JavaVisible method
isvalid is a built-in method                                   % matlab.mixin.internal.DefaultFactoryPropHandler method
isvalid is a built-in method                                   % connector.internal.StoreGrootAppdata method
isvalid is a built-in method                                   % matlab.metadata.Method method
isvalid is a built-in method                                   % appdesigner.internal.application.AppDesignerServiceProvider method
isvalid is a built-in method                                   % appdesservices.internal.peermodel.BrowserControllerFactory method
isvalid is a built-in method                                   % appdesigner.internal.application.startup.StartupStateProviderFactory method
isvalid is a built-in method                                   % appdesigner.internal.application.figure.FigureService method
isvalid is a built-in method                                   % appdesigner.internal.application.startup.DesktopStartupStateProviderFactory method
isvalid is a built-in method                                   % appdesigner.internal.application.figure.DesktopFigureService method
isvalid is a built-in method                                   % appdesservices.internal.peermodel.PeerNodeProxyView method
isvalid is a built-in method                                   % appdesservices.internal.interfaces.view.AbstractProxyView method
isvalid is a built-in method                                   % appdesservices.internal.interfaces.controller.mixin.ClientEventReceiver method
isvalid is a built-in method                                   % viewmodel.internal.factory.ManagerFactoryProducer method
isvalid is a built-in method                                   % viewmodel.internal.factory.CPPVMMFactoryHelper method
isvalid is a built-in method                                   % appdesigner.internal.application.startup.OnlineStartupStateProviderFactory method
isvalid is a built-in method                                   % appdesigner.internal.application.figure.OnlineFigureService method
isvalid is a built-in method                                   % onCleanup method
isvalid is a built-in method                                   % matlab.settings.SettingsGroup method
isvalid is a built-in method                                   % matlab.settings.Setting method
isvalid is a built-in method                                   % connector.internal.lifecycle.FigureContainerInitialFeatureState method
isvalid is a built-in method                                   % matlab.graphics.eventdata.Update method
isvalid is a built-in method                                   % matlab.graphics.eventdata.OuterPositionChanged method
isvalid is a built-in method                                   % matlab.graphics.axis.AbstractAxes method
isvalid is a built-in method                                   % matlab.graphics.axis.Axes method
isvalid is a built-in method                                   % matlab.graphics.axis.decorator.AxisDecoration method
isvalid is a built-in method                                   % matlab.graphics.axis.decorator.AxisRulerBase method
isvalid is a built-in method                                   % matlab.graphics.axis.decorator.Backdrop method
isvalid is a built-in method                                   % matlab.graphics.axis.decorator.BoxFrame method
isvalid is a built-in method                                   % matlab.graphics.axis.dataspace.CartesianDataSpace method
isvalid is a built-in method                                   % matlab.graphics.axis.colorspace.ColorSpace method
isvalid is a built-in method                                   % matlab.graphics.axis.dataspace.DataSpace method
isvalid is a built-in method                                   % matlab.graphics.axis.decorator.DecorationContainer method
isvalid is a built-in method                                   % matlab.graphics.axis.decorator.Grid method
isvalid is a built-in method                                   % matlab.graphics.axis.HintConsumer method
isvalid is a built-in method                                   % matlab.graphics.axis.colorspace.MapColorSpace method
isvalid is a built-in method                                   % matlab.graphics.axis.decorator.NumericRuler method
isvalid is a built-in method                                   % matlab.graphics.axis.PlotTarget method
isvalid is a built-in method                                   % matlab.graphics.axis.PlotTargetManager method
isvalid is a built-in method                                   % matlab.graphics.axis.decorator.Ruler method
isvalid is a built-in method                                   % matlab.graphics.axis.decorator.ScalableAxisRuler method
isvalid is a built-in method                                   % matlab.graphics.axis.decorator.SimpleGrid method
isvalid is a built-in method                                   % matlab.graphics.axis.dataspace.UniformCartesianDataSpace method
isvalid is a built-in method                                   % matlab.graphics.axis.camera.Camera method
isvalid is a built-in method                                   % matlab.graphics.axis.camera.Camera2D method
isvalid is a built-in method                                   % matlab.graphics.axis.camera.Camera3D method
isvalid is a built-in method                                   % matlab.graphics.primitive.Marker method
isvalid is a built-in method                                   % matlab.graphics.primitive.Patch method
isvalid is a built-in method                                   % matlab.graphics.primitive.SurfaceXYZData method
isvalid is a built-in method                                   % matlab.graphics.primitive.Text method
isvalid is a built-in method                                   % matlab.graphics.interactor.ListOfPointsHighlight method
isvalid is a built-in method                                   % matlab.graphics.layout.Layout method
isvalid is a built-in method                                   % matlab.graphics.mixin.AbstractAxesParentable method
isvalid is a built-in method                                   % matlab.graphics.mixin.AffectAutoLimitsMixin method
isvalid is a built-in method                                   % matlab.graphics.mixin.AxesParentable method
isvalid is a built-in method                                   % matlab.graphics.mixin.Background method
isvalid is a built-in method                                   % matlab.graphics.mixin.ChartLayoutable method
isvalid is a built-in method                                   % matlab.graphics.mixin.ColorOrderUser method
isvalid is a built-in method                                   % matlab.graphics.mixin.GeographicAxesParentable method
isvalid is a built-in method                                   % matlab.graphics.eventdata.LegendableObjectsUpdated method
isvalid is a built-in method                                   % matlab.graphics.mixin.LegendTarget method
isvalid is a built-in method                                   % matlab.graphics.mixin.Legendable method
isvalid is a built-in method                                   % matlab.graphics.mixin.MapAxesParentable method
isvalid is a built-in method                                   % matlab.graphics.mixin.PolarAxesParentable method
isvalid is a built-in method                                   % matlab.graphics.mixin.SceneNodeGroup method
isvalid is a built-in method                                   % matlab.graphics.mixin.NextSeriesIndexProvider method
isvalid is a built-in method                                   % matlab.graphics.mixin.UIParentable method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.AxesLabelPrimitive method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.DimensionalNormalizedDataTransform method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.BackdropPrimitive method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.BoxPrimitive method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.ClipNode method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.Geometry method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.GridPrimitive method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.LightSource method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.LineLoop method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.LineStrip method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.Marker method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.CompositeMarker method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.PrimitiveBase method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.PrimitiveContainer method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.Quadrilateral method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.RulerPrimitive method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.ProgressiveLine method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.Text method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.TriangleStrip method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.ViewDependentTransform method
isvalid is a built-in method                                   % matlab.graphics.eventdata.Annotation method
isvalid is a built-in method                                   % matlab.graphics.eventdata.LegendEntry method
isvalid is a built-in method                                   % matlab.graphics.eventdata.UpdateState method
isvalid is a built-in method                                   % matlab.graphics.primitive.Data method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.Group method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.GroupBase method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.Positionable method
isvalid is a built-in method                                   % matlab.graphics.primitive.Group method
isvalid is a built-in method                                   % matlab.graphics.primitive.Transform method
isvalid is a built-in method                                   % matlab.graphics.eventdata.Reparent method
isvalid is a built-in method                                   % matlab.graphics.primitive.world.SceneNode method
isvalid is a built-in method                                   % matlab.graphics.axis.colorspace.ColorsIterator method
isvalid is a built-in method                                   % matlab.graphics.axis.colorspace.IndexColorsIterator method
isvalid is a built-in method                                   % matlab.graphics.axis.dataspace.PointsIterator method
isvalid is a built-in method                                   % matlab.graphics.axis.dataspace.XYZPointsIterator method
isvalid is a built-in method                                   % matlab.graphics.eventdata.PreUpdate method
isvalid is a built-in method                                   % matlab.graphics.primitive.canvas.Canvas method
isvalid is a built-in method                                   % matlab.graphics.primitive.canvas.CanvasFactory method
isvalid is a built-in method                                   % matlab.graphics.interaction.interactioncontainers.CartesianAxesInteractionContainer method
isvalid is a built-in method                                   % matlab.graphics.interaction.interactioncontainers.StandardAxesInteractionContainer method
isvalid is a built-in method                                   % matlab.graphics.interaction.interactioncontainers.BaseAxesInteractionContainer method
isvalid is a built-in method                                   % matlab.graphics.interaction.interactioncontainers.InteractionContainer method
isvalid is a built-in method                                   % matlab.graphics.interaction.keyboardinteraction.AxesKeyboardInteractionManager method
isvalid is a built-in method                                   % matlab.graphics.primitive.canvas.HTMLCanvas method
isvalid is a built-in method                                   % matlab.graphics.primitive.canvas.HTMLCanvasFactory method
isvalid is a built-in method                                   % matlab.graphics.interaction.graphicscontrol.InteractionsManager method
isvalid is a built-in method                                   % matlab.graphics.interaction.graphicscontrol.ControlManager method
isvalid is a built-in method                                   % matlab.graphics.internal.CanvasSetup method
isvalid is a built-in method                                   % matlab.graphics.shape.internal.ScribeStackManager method
isvalid is a built-in method                                   % matlab.graphics.chart.interaction.DataAnnotatable method
isvalid is a built-in method                                   % matlab.graphics.mixin.DataProperties method
isvalid is a built-in method                                   % matlab.graphics.chart.primitive.Line method
isvalid is a built-in method                                   % matlab.graphics.chart.mixin.SurfaceBrushable method
isvalid is a built-in method                                   % matlab.graphics.chart.interaction.SurfaceBrushing method
isvalid is a built-in method                                   % matlab.graphics.shape.internal.ScribeLayer method
isvalid is a built-in method                                   % matlab.graphics.shape.internal.AnnotationPane method
isvalid is a built-in method                                   % matlab.graphics.mixin.CustomChildrenContainer method
isvalid is a built-in method                                   % event.listener method
isvalid is a built-in method                                   % matlab.graphics.controls.internal.ToolbarFactory method
isvalid is a built-in method                                   % matlab.graphics.controls.WebToolbarController method
isvalid is a built-in method                                   % matlab.graphics.controls.ToolbarController method
isvalid is a built-in method                                   % matlab.graphics.controls.internal.PointerMixin method
isvalid is a built-in method                                   % matlab.graphics.controls.AxesToolbar method
isvalid is a built-in method                                   % matlab.lang.HandlePlaceholder method
isvalid is a built-in method                                   % matlab.graphics.controls.internal.AxesBasedModeStrategy method
isvalid is a built-in method                                   % matlab.graphics.controls.internal.AbstractModeStrategy method
isvalid is a built-in method                                   % matlab.graphics.controls.internal.AxesPointerModeStrategy method
isvalid is a built-in method                                   % matlab.graphics.controls.internal.PointerModeStrategy method
isvalid is a built-in method                                   % matlab.graphics.interaction.graphicscontrol.ControlFactory method
isvalid is a built-in method                                   % event.EventData method
isvalid is a built-in method                                   % matlab.graphics.eventdata.ChildEventData method
isvalid is a built-in method                                   % matlab.graphics.interaction.graphicscontrol.AxesControl method
isvalid is a built-in method                                   % matlab.graphics.interaction.graphicscontrol.layoutable.GridLayoutableControl method
isvalid is a built-in method                                   % matlab.graphics.interaction.graphicscontrol.layoutable.LayoutableControl method
isvalid is a built-in method                                   % matlab.graphics.interaction.graphicscontrol.GenericControl method
isvalid is a built-in method                                   % matlab.graphics.interaction.graphicscontrol.ControlBase method
isvalid is a built-in method                                   % event.proplistener method
isvalid is a built-in method                                   % matlab.graphics.interaction.internal.UnifiedAxesInteractions method
isvalid is a built-in method                                   % matlab.metadata.DynamicProperty method
isvalid is a built-in method                                   % event.PropertyEvent method
isvalid is a built-in method                                   % matlab.graphics.chart.primitive.Surface method
isvalid is a built-in method                                   % matlab.ui.internal.controller.FigureController method
isvalid is a built-in method                                   % matlab.ui.internal.controller.WebCanvasContainerController method
isvalid is a built-in method                                   % matlab.ui.internal.componentframework.WebContainerController method
isvalid is a built-in method                                   % matlab.ui.internal.componentframework.WebComponentController method
isvalid is a built-in method                                   % matlab.ui.internal.componentframework.WebController method
isvalid is a built-in method                                   % matlab.ui.internal.componentframework.services.optional.ControllerInterface method
isvalid is a built-in method                                   % matlab.ui.internal.componentframework.services.optional.EventDispatcherAddOn method
isvalid is a built-in method                                   % matlab.ui.internal.componentframework.services.core.identification.IdentificationService method
isvalid is a built-in method                                   % matlab.ui.internal.controller.CanvasController method
isvalid is a built-in method                                   % matlab.ui.internal.controller.FigureUpdatesFromClient method
isvalid is a built-in method                                   % matlab.ui.internal.componentframework.services.optional.ViewReadyInterface method
isvalid is a built-in method                                   % appdesservices.internal.interfaces.view.EmptyViewModel method
isvalid is a built-in method                                   % matlab.ui.internal.componentframework.services.core.propertymanagement.PropertyManagementService method
isvalid is a built-in method                                   % matlab.ui.internal.componentframework.services.core.identification.WebIdentificationService method
isvalid is a built-in method                                   % matlab.ui.internal.componentframework.services.core.eventhandling.WebEventHandlingService method
isvalid is a built-in method                                   % matlab.ui.internal.controller.platformhost.FigurePlatformHostFactory method
isvalid is a built-in method                                   % matlab.ui.internal.controller.platformhost.CEFFigurePlatformHost method
isvalid is a built-in method                                   % matlab.ui.internal.controller.platformhost.FigurePlatformHost method
isvalid is a built-in method                                   % matlab.ui.internal.componentframework.services.optional.ScrollableBehaviorAddOn method
isvalid is a built-in method                                   % matlab.ui.internal.componentframework.services.optional.BehaviorAddOn method
isvalid is a built-in method                                   % matlab.ui.internal.componentframework.services.optional.HasContextMenuBehaviorAddOn method
isvalid is a built-in method                                   % viewmodel.internal.EventObservable method
isvalid is a built-in method                                   % viewmodel.internal.EventDispatchable method
isvalid is a built-in method                                   % viewmodel.internal.ViewModelManagerFactory method
isvalid is a built-in method                                   % viewmodel.internal.ViewModelManager method
isvalid is a built-in method                                   % viewmodel.internal.ViewModel method
isvalid is a built-in method                                   % viewmodel.internal.EventListenerHandle method
isvalid is a built-in method                                   % appdesservices.internal.interfaces.view.ViewModelFactoryManager method
isvalid is a built-in method                                   % appdesservices.internal.interfaces.view.ViewModelFactory method
isvalid is a built-in method                                   % matlab.ui.internal.controller.FigurePeerModelInfo method
isvalid is a built-in method                                   % matlab.ui.internal.controller.FigureLifecycleControllerManager method
isvalid is a built-in method                                   % matlab.ui.internal.controller.FigureLifecycleController method
isvalid is a built-in method                                   % matlab.internal.cef.webwindow method
isvalid is a built-in method                                   % matlab.internal.cef.webwindowmanager method
isvalid is a built-in method                                   % matlab.internal.WebwindowManagerInterface method
isvalid is a built-in method                                   % matlabshared.asyncio.internal.Channel method
isvalid is a built-in method                                   % matlabshared.testmeas.ReentryProtectionFSM method
isvalid is a built-in method                                   % matlabshared.asyncio.internal.MessageHandler method
isvalid is a built-in method                                   % asyncioimpl.Channel method
isvalid is a built-in method                                   % asyncioimpl.InputStream method
isvalid is a built-in method                                   % asyncioimpl.OutputStream method
isvalid is a built-in method                                   % asyncioimpl.MessageHandler method
isvalid is a built-in method                                   % matlabshared.asyncio.internal.InputStream method
isvalid is a built-in method                                   % matlabshared.asyncio.internal.Stream method
isvalid is a built-in method                                   % matlabshared.asyncio.internal.OutputStream method
isvalid is a built-in method                                   % matlab.internal.editor.figure.FigureUtils method
isvalid is a built-in method                                   % event.ChildEvent method
isvalid is a built-in method                                   % matlab.ui.internal.controller.DivFigureBrowserRefreshHandler method
isvalid is a built-in method                                   % matlab.ui.internal.controller.DivFigureDockedFigureContainerUndockInWindowHandler method
isvalid is a built-in method                                   % matlab.io.internal.vfs.stream.RemoteToLocal method
isvalid is a built-in method                                   % matlab.io.text.internal.TextSourceWrapper method
isvalid is a built-in method                                   % matlab.io.text.internal.TextParser method
isvalid is a built-in method                                   % matlab.io.internal.meta.FunctionInterfaceMetaProperty method
isvalid is a built-in method                                   % matlab.io.internal.meta.FunctionInterfaceMetaClass method
isvalid is a built-in method                                   % matlab.io.text.internal.TabularTextReader method
isvalid is a built-in method                                   % matlab.io.spreadsheet.internal.Sheet method
isvalid is a built-in method                                   % internal.matlab.inspector.peer.DefaultPropertyInspector method
isvalid is a built-in method                                   % internal.matlab.inspector.peer.InspectorFactory method
isvalid is a built-in method                                   % internal.matlab.variableeditor.peer.MF0ViewModelVEProvider method
isvalid is a built-in method                                   % internal.matlab.variableeditor.peer.RemoteProvider method
isvalid is a built-in method                                   % internal.matlab.variableeditor.MLManager method
isvalid is a built-in method                                   % internal.matlab.variableeditor.Manager method
isvalid is a built-in method                                   % internal.matlab.datatoolsservices.WorkspaceListener method
isvalid is a built-in method                                   % internal.matlab.variableeditor.peer.PeerUtils method
isvalid is a built-in method                                   % internal.matlab.inspector.peer.PeerInspectorManager method
isvalid is a built-in method                                   % internal.matlab.inspector.Inspector method
isvalid is a built-in method                                   % internal.matlab.variableeditor.MLWorkspace method
isvalid is a built-in method                                   % internal.matlab.variableeditor.peer.RemoteManager method
isvalid is a built-in method                                   % PerfTools.Tracer method
isvalid is a built-in method                                   % DAStudio.IconManager method
isvalid is a built-in method                                   % Simulink.ConfigSet method
isvalid is a built-in method                                   % Simulink.SolverCC method
isvalid is a built-in method                                   % Simulink.DataIOCC method
isvalid is a built-in method                                   % Simulink.OptimizationCC method
isvalid is a built-in method                                   % Simulink.DebuggingCC method
isvalid is a built-in method                                   % Simulink.HardwareCC method
isvalid is a built-in method                                   % Simulink.ModelReferenceCC method
isvalid is a built-in method                                   % Simulink.SFSimCC method
isvalid is a built-in method                                   % Simulink.RTWCC method
isvalid is a built-in method                                   % Simulink.CodeAppCC method
isvalid is a built-in method                                   % Simulink.TargetCC method
isvalid is a built-in method                                   % Simulink.GRTTargetCC method
isvalid is a built-in method                                   % Simulink.BaseConfig method
isvalid is a built-in method                                   % Simulink.ConfigComponent method
isvalid is a built-in method                                   % Simulink.ConfigSetRoot method
isvalid is a built-in method                                   % Simulink.CustomCC method
isvalid is a built-in method                                   % matlab.mixin.internal.TreeTraversable method
isvalid is a built-in method                                   % matlab.mixin.internal.TreeNode method
isvalid is a built-in method                                   % SlCovCC.ConfigComp method
isvalid is a built-in method                                   % Simulink.Object method
isvalid is a built-in method                                   % Simulink.Root method
isvalid is a built-in method                                   % Simulink.loadsave.SLXPackageReader method
isvalid is a built-in method                                   % SLCustomization.Manager method
isvalid is a built-in method                                   % DAS.InterfaceManager method
isvalid is a built-in method                                   % linkfoundation.pjtgenerator.ProcRegistry method
isvalid is a built-in method                                   % linkfoundation.pjtgenerator.AdaptorRegistry method
isvalid is a built-in method                                   % LBCustomizer method
isvalid is a built-in method                                   % modelfinder.init.ModelFinderCustomizerInit method
isvalid is a built-in method                                   % matlabshared.supportpkg.internal.SupportPackageRootHandler method
isvalid is a built-in method                                   % matlabshared.supportpkg.internal.SettingWriterReader method
isvalid is a built-in method                                   % matlabshared.supportpkg.internal.SingleRootHandler method
isvalid is a built-in method                                   % realtime.internal.TargetHardware method
isvalid is a built-in method                                   % codertarget.tools.TargetHardwareDeprecationInfo method
isvalid is a built-in method                                   % Simulink.SLTCustomizer method
isvalid is a built-in method                                   % Simulink.harness.HarnessCreateCustomizer method
isvalid is a built-in method                                   % Simulink.CodeCoverageTools method
isvalid is a built-in method                                   % Simulink.ExtModeTransports method
isvalid is a built-in method                                   % rtw.codegenObjectives.ObjectiveCustomizer method
isvalid is a built-in method                                   % Simulink.LookupTableEditorCustomizer method
isvalid is a built-in method                                   % mpt.RTWBuildCustomizer method
isvalid is a built-in method                                   % mpt.MiscCustomizer method
isvalid is a built-in method                                   % coder.targetreg.internal.TargetRegistry method
isvalid is a built-in method                                   % targetframework.internal.repository.TargetRepository method
isvalid is a built-in method                                   % targetframework.internal.repository.datasource.DataSourceDescription method
isvalid is a built-in method                                   % targetframework.internal.repository.datasource.Definitions method
isvalid is a built-in method                                   % codertarget.TargetRegistry method
isvalid is a built-in method                                   % codertarget.TargetBoardRegistry method
isvalid is a built-in method                                   % matlabshared.svd.internal.InterruptDefRegistry method
isvalid is a built-in method                                   % FileWrapper__ method
isvalid is a built-in method                                   % codertarget.interrupts.HWInterruptInfo method
isvalid is a built-in method                                   % codertarget.Info method
isvalid is a built-in method                                   % codertarget.interrupts.InterruptGroup method
isvalid is a built-in method                                   % codertarget.attributes.BuildConfigurationInfo method
isvalid is a built-in method                                   % codertarget.interrupts.Interrupt method
isvalid is a built-in method                                   % codertarget.interrupts.Event method
isvalid is a built-in method                                   % DVG.Registry method
isvalid is a built-in method                                   % codertarget.TargetListener method
isvalid is a built-in method                                   % RTW.TargetListener method
isvalid is a built-in method                                   % ModelAdvisor.Preferences method
isvalid is a built-in method                                   % Simulink.scopes.ViewerLibraryCache method
isvalid is a built-in method                                   % connector.internal.academy.i18n.Language method
isvalid is a built-in method                                   % connector.internal.academy.graders.CommandLineGrader method
isvalid is a built-in method                                   % connector.internal.academy.graders.Grader method
isvalid is a built-in method                                   % matlab.unittest.TestRunner method
isvalid is a built-in method                                   % matlab.unittest.internal.TestContentOperator method
isvalid is a built-in method                                   % matlab.unittest.internal.parameters.ParameterDataSource method
isvalid is a built-in method                                   % matlab.unittest.internal.WarningStackPrinter method
isvalid is a built-in method                                   % matlab.unittest.meta.class method
isvalid is a built-in method                                   % matlab.unittest.meta.method method
isvalid is a built-in method                                   % matlab.unittest.meta.property method
isvalid is a built-in method                                   % matlab.unittest.TestCase method
isvalid is a built-in method                                   % matlab.unittest.internal.RunOnceTestRunData method
isvalid is a built-in method                                   % matlab.unittest.plugins.plugindata.RunPluginData method
isvalid is a built-in method                                   % matlab.unittest.internal.Teardownable method
isvalid is a built-in method                                   % matlab.unittest.fixtures.EmptyFixture method
isvalid is a built-in method                                   % matlab.unittest.plugins.plugindata.TestContentCreationPluginData method
isvalid is a built-in method                                   % matlab.unittest.plugins.plugindata.ImplicitFixturePluginData method
isvalid is a built-in method                                   % matlab.unittest.internal.plugins.DeterminedDetailsLocationProvider method
isvalid is a built-in method                                   % matlab.unittest.internal.LabelEventData method
isvalid is a built-in method                                   % matlab.unittest.internal.qualifications.QualificationFailedExceptionMarker method
isvalid is a built-in method                                   % matlab.unittest.plugins.plugindata.MethodEvaluationPluginData method
isvalid is a built-in method                                   % matlab.unittest.internal.plugins.UndeterminedDetailsLocationProvider method
isvalid is a built-in method                                   % matlab.unittest.internal.TestContentOperatorList method
isvalid is a built-in method                                   % matlab.unittest.fixtures.Fixture method
isvalid is a built-in method                                   % matlab.unittest.internal.TestContent method
isvalid is a built-in method                                   % matlab.unittest.internal.mixin.Subscribable method
isvalid is a built-in method                                   % matlab.unittest.qualifications.ExceptionEventData method
isvalid is a built-in method                                   % matlab.unittest.internal.qualifications.ThrowingQualifiable method
isvalid is a built-in method                                   % matlab.unittest.internal.SerialTestRunStrategy method
isvalid is a built-in method                                   % matlab.unittest.internal.TestRunStrategy method
isvalid is a built-in method                                   % matlab.unittest.plugins.plugindata.FinalizedSuitePluginData method
isvalid is a built-in method                                   % matlab.unittest.plugins.plugindata.TestSuiteRunPluginData method
isvalid is a built-in method                                   % matlab.unittest.internal.TestContentOperatorReverseIterator method
isvalid is a built-in method                                   % matlab.unittest.internal.PluginList method
isvalid is a built-in method                                   % connector.internal.academy.plugins.GraderPlugin method
isvalid is a built-in method                                   % connector.internal.academy.plugins.TestIndexPlugin method
isvalid is a built-in method                                   % matlab.unittest.plugins.TestRunnerPlugin method
isvalid is a built-in method                                   % connector.internal.academy.plugins.DiagnosticsPlugin method
isvalid is a built-in method                                   % matlab.unittest.internal.diagnostics.ScriptContentsDiagnostic method
isvalid is a built-in method                                   % matlab.unittest.FunctionTestCase method
isvalid is a built-in method                                   % matlab.unittest.internal.services.fileextension.FileExtensionLiaison method
isvalid is a built-in method                                   % matlab.unittest.internal.fixtures.HiddenPathFixture method
isvalid is a built-in method                                   % matlab.unittest.internal.fixtures.HiddenCurrentFolderFixture method
isvalid is a built-in method                                   % matlab.unittest.internal.ClassBoundaryMarker method
isvalid is a built-in method                                   % matlab.unittest.internal.TestRunData method
isvalid is a built-in method                                   % matlab.unittest.internal.plugins.TestResultDetailsBuffer method
isvalid is a built-in method                                   % matlab.unittest.plugins.plugindata.PluginData method
isvalid is a built-in method                                   % matlab.automation.streams.ToStandardOutput method
isvalid is a built-in method                                   % matlab.automation.streams.OutputStream method
isvalid is a built-in method                                   % matlab.unittest.internal.plugins.DetailsLocationProvider method
isvalid is a built-in method                                   % matlab.unittest.internal.TeardownDelegate method
isvalid is a built-in method                                   % matlab.unittest.internal.CancelableCleanup method
isvalid is a built-in method                                   % matlab.unittest.internal.FunctionTestCase method
isvalid is a built-in method                                   % matlab.unittest.internal.RunnableTestContent method
isvalid is a built-in method                                   % matlab.unittest.qualifications.Assertable method
isvalid is a built-in method                                   % matlab.unittest.internal.qualifications.PostFailureCallbackProvider method
isvalid is a built-in method                                   % matlab.unittest.qualifications.Assumable method
isvalid is a built-in method                                   % matlab.unittest.qualifications.FatalAssertable method
isvalid is a built-in method                                   % matlab.unittest.internal.Loggable method
isvalid is a built-in method                                   % matlab.unittest.diagnostics.LoggedDiagnosticEventData method
isvalid is a built-in method                                   % matlab.unittest.qualifications.Verifiable method
isvalid is a built-in method                                   % matlab.unittest.internal.Measurable method
isvalid is a built-in method                                   % matlab.unittest.internal.qualifications.AssertionDelegate method
isvalid is a built-in method                                   % matlab.unittest.internal.qualifications.QualificationDelegate method
isvalid is a built-in method                                   % matlab.unittest.internal.qualifications.AssumptionDelegate method
isvalid is a built-in method                                   % matlab.unittest.internal.qualifications.FatalAssertionDelegate method
isvalid is a built-in method                                   % matlab.unittest.internal.qualifications.VerificationDelegate method
isvalid is a built-in method                                   % matlab.automation.diagnostics.StringDiagnostic method
isvalid is a built-in method                                   % matlab.automation.diagnostics.Diagnostic method
isvalid is a built-in method                                   % matlab.automation.diagnostics.Artifact method
isvalid is a built-in method                                   % matlab.automation.diagnostics.FileArtifact method
isvalid is a built-in method                                   % matlab.unittest.internal.diagnostics.DiagnosticResultCache method
isvalid is a built-in method                                   % matlab.automation.internal.diagnostics.DiagnosticPlaceholder method
isvalid is a built-in method                                   % matlab.automation.internal.services.stacktrimming.StackTrimmingLiaison method
isvalid is a built-in method                                   % matlab.unittest.plugins.QualifyingPlugin method
isvalid is a built-in method                                   % connector.internal.academy.graders.ScriptGrader method
isvalid is a built-in method                                   % matlabshared.supportpkg.internal.LegacySupportPackageRegistryInfo method
isvalid is a built-in method                                   % matlabshared.supportpkg.internal.sppkglegacy.SupportPackageRegistryPluginBase method
isvalid is a built-in method                                   % matlab.io.xml.dom.Document method
isvalid is a built-in method                                   % matlab.io.xml.dom.Element method
isvalid is a built-in method                                   % matlab.io.xml.dom.Node method
isvalid is a built-in method                                   % matlab.io.xml.dom.NodeList method
isvalid is a built-in method                                   % matlab.io.xml.dom.Parser method
isvalid is a built-in method                                   % matlab.io.xml.dom.Object method
isvalid is a built-in method                                   % slxmlcomp.internal.highlight.ModelRenameMediator method
isvalid is a built-in method                                   % slxmlcomp.internal.highlight.ListenerCollection method
isvalid is a built-in method                                   % Simulink.DABaseObject method
isvalid is a built-in method                                   % da.internal.SupportsApplicationData method
isvalid is a built-in method                                   % slxmlcomp.internal.highlight.ModelCloseMediator method
isvalid is a built-in method                                   % matlab.unittest.plugins.DiagnosticsRecordingPlugin method
isvalid is a built-in method                                   % scoringengine.OutputPlugin method
isvalid is a built-in method                                   % scoringengine.FiguresPlugin method
isvalid is a built-in method                                   % matlab.unittest.plugins.Parallelizable method
isvalid is a built-in method                                   % matlab.unittest.internal.plugins.EventRecordProcessor method
isvalid is a built-in method                                   % matlab.unittest.plugins.diagnosticrecord.DiagnosticRecord method
isvalid is a built-in method                                   % matlab.automation.internal.services.namevalue.NameValueProviderLiaison method
isvalid is a built-in method                                   % matlab.unittest.internal.services.suitemodifier.SuiteModifierLiaison method
isvalid is a built-in method                                   % matlab.unittest.internal.services.suitecreation.SuiteCreationLiaison method
isvalid is a built-in method                                   % matlab.unittest.internal.services.namingconvention.NamingConventionLiaison method
isvalid is a built-in method                                   % matlab.unittest.internal.ContentWrapper method
isvalid is a built-in method                                   % matlab.unittest.fixtures.PathFixture method
isvalid is a built-in method                                   % matlab.unittest.fixtures.CurrentFolderFixture method
isvalid is a built-in method                                   % matlab.unittest.internal.eventrecords.EventRecord method
isvalid is a built-in method                                   % matlab.unittest.internal.plugins.EventRecordProducer method
isvalid is a built-in method                                   % matlab.unittest.internal.eventrecords.ExceptionEventRecord method
isvalid is a built-in method                                   % matlab.unittest.internal.plugins.NullDetailsLocationProvider method
isvalid is a built-in method                                   % matlab.unittest.diagnostics.ConstraintDiagnostic method
isvalid is a built-in method                                   % matlab.unittest.constraints.Comparison method
isvalid is a built-in method                                   % matlab.unittest.internal.services.constraints.ComparatorLiaison method
isvalid is a built-in method                                   % FileReadHelper method
isvalid is a built-in method                                   % scoringengine.ResultGenerator method
isvalid is a built-in method                                   % internal.matlab.legacyvariableeditor.peer.PeerManagerFactory method
isvalid is a built-in method                                   % internal.matlab.legacyvariableeditor.peer.PeerManager method
isvalid is a built-in method                                   % internal.matlab.legacyvariableeditor.MLManager method
isvalid is a built-in method                                   % internal.matlab.legacyvariableeditor.Manager method
isvalid is a built-in method                                   % peermodel.internal.PeerModelManagers method
isvalid is a built-in method                                   % peermodel.internal.PeerModelManagerServerMode method
isvalid is a built-in method                                   % peermodel.internal.PeerModelManager method
isvalid is a built-in method                                   % peermodel.internal.PeerNodeServerMode method
isvalid is a built-in method                                   % peermodel.internal.PeerNode method
isvalid is a built-in method                                   % peermodel.internal.Utility method
isvalid is a built-in method                                   % internal.matlab.legacyvariableeditor.peer.PeerUtils method
isvalid is a built-in method                                   % matlab.internal.timer.TimerInfo method
isvalid is a built-in method                                   % peermodel.internal.PeerModelEventData method
isvalid is a built-in method                                   % mupadengine method
isvalid is a built-in method                                   % matlab.internal.editor.FigureManager method
isvalid is a built-in method                                   % matlab.internal.editor.OutputsManager method
isvalid is a built-in method                                   % matlab.internal.editor.VariableManager method
isvalid is a built-in method                                   % matlab.internal.editor.PrewarmingSuppressor method
isvalid is a built-in method                                   % matlab.internal.editor.StaticData method
isvalid is a built-in method                                   % matlab.internal.structuredoutput.EventsCollector method
isvalid is a built-in method                                   % matlab.internal.structuredoutput.StreamGovernor method
isvalid is a built-in method                                   % matlab.internal.structuredoutput.DebugHandler method
isvalid is a built-in method                                   % matlab.internal.structuredoutput.RegionEvaluator method
isvalid is a built-in method                                   % matlab.internal.structuredoutput.TempFileInfo method
isvalid is a built-in method                                   % matlab.internal.structuredoutput.ExecutionTracker method
isvalid is a built-in method                                   % matlab.internal.editor.debug.DebugUtilities method
isvalid is a built-in method                                   % matlab.internal.editor.OutputEventPreprocessor method
isvalid is a built-in method                                   % matlab.internal.editor.StreamOutputsSignal method
isvalid is a built-in method                                   % matlab.internal.editor.debug.DebugManager method
isvalid is a built-in method                                   % matlab.internal.editor.FigureEventDisabler method
isvalid is a built-in method                                   % matlab.internal.editor.StackPruner method
isvalid is a built-in method                                   % matlab.internal.editor.RegionMapping method
isvalid is a built-in method                                   % matlab.internal.editor.eval.TempFolder method
isvalid is a built-in method                                   % matlab.internal.path.ExcludedPathStore method
isvalid is a built-in method                                   % matlab.internal.editor.OutputUtilitiesDataHolder method
isvalid is a built-in method                                   % matlab.internal.webservices.HTTPConnector method
isvalid is a built-in method                                   % matlab.internal.webservices.HTTPConnectionAdapter method
isvalid is a built-in method                                   % matlab.net.http.internal.ProgressReporter method
isvalid is a built-in method                                   % matlab.net.http.io.ContentProvider method
isvalid is a built-in method                                   % matlab.net.http.io.ContentConsumer method
isvalid is a built-in method                                   % matlab.unittest.plugins.diagnosticrecord.ExceptionDiagnosticRecord method
isvalid is a built-in method                                   % matlabshared.asyncio.internal.CustomEventInfo method
isvalid is a built-in method                                   % mls.internal.ImageUtils method
isvalid is a built-in method                                   % viewmodel.internal.interface.eventdata.GenericEventData method
isvalid is a built-in method                                   % viewmodel.internal.interface.eventdata.StructData method
isvalid is a built-in method                                   % matlab.graphics.internal.mlprintjob method
isvalid is a built-in method                                   % matlab.graphics.primitive.canvas.JavaCanvas method
isvalid is a built-in method                                   % matlab.ui.internal.dialog.DialogHelper method
isvalid is a built-in method                                   % matlab.graphics.internal.printEnhanceTextures method
isvalid is a built-in method                                   % matlab.graphics.internal.printUtility method
isvalid is a built-in method                                   % matlab.ui.internal.PositionUtils method
isvalid is a built-in method                                   % matlab.ui.controls.AxesToolbar method
isvalid is a built-in method                                   % matlab.graphics.internal.export.GraphicsExportable method
isvalid is a built-in method                                   % matlab.graphics.illustration.internal.AbstractChartIllustration method
isvalid is a built-in method                                   % matlab.graphics.illustration.Legend method
isvalid is a built-in method                                   % matlab.graphics.illustration.internal.AbstractExpandableLegend method
isvalid is a built-in method                                   % matlab.graphics.illustration.legend.Text method
isvalid is a built-in method                                   % matlab.graphics.internal.PlotEditBehavior method
isvalid is a built-in method                                   % matlab.graphics.internal.HGBehavior method
isvalid is a built-in method                                   % matlab.graphics.internal.PrintBehavior method
isvalid is a built-in method                                   % matlab.graphics.shape.internal.AxesLayoutManager method
isvalid is a built-in method                                   % matlab.graphics.chartcontainer.mixin.internal.OuterPositionChangedEventMixin method
isvalid is a built-in method                                   % matlab.graphics.chart.internal.OuterPositionChangedEventData method
isvalid is a built-in method                                   % matlab.graphics.chart.primitive.Scatter method
isvalid is a built-in method                                   % matlab.graphics.chart.primitive.internal.AbstractScatter method
isvalid is a built-in method                                   % matlab.graphics.chart.primitive.internal.abstractscatter.IconColorInfoCache method
isvalid is a built-in method                                   % matlab.graphics.interaction.interactioncontainers.TextInteractionContainer method
isvalid is a built-in method                                   % matlab.graphics.interaction.internal.TextInteractions method
isvalid is a built-in method                                   % matlab.graphics.interaction.graphicscontrol.TextControl method
isvalid is a built-in method                                   % matlab.ui.control.internal.controller.mixin.LayoutableController method
isvalid is a built-in method                                   % appdesservices.internal.interfaces.controller.AbstractControllerMixin method
isvalid is a built-in method                                   % matlab.graphics.internal.SubplotListenersManager method
isvalid is a built-in method                                   % matlab.graphics.internal.SubplotDeleteListenersManager method
isvalid is a built-in method                                   % matlab.graphics.controls.internal.FadeGroup method
isvalid is a built-in method                                   % matlab.graphics.controls.internal.Control method
isvalid is a built-in method                                   % matlab.unittest.internal.diagnostics.RequirementDiagnostic method
isvalid is a built-in method                                   % matlab.automation.diagnostics.ExtendedDiagnostic method
isvalid is a built-in method                                   % AssessmentDiagnostic method
isvalid is a built-in method                                   % matlab.graphics.chart.primitive.Contour method
isvalid is a built-in method                                   % matlab.graphics.chart.internal.contour.ContourDataCache method
isvalid is a built-in method                                   % matlab.graphics.internal.CameraToolBarManager method
isvalid is a built-in method                                   % matlab.graphics.internal.SceneLight method
isvalid is a built-in method                                   % matlab.graphics.illustration.ColorBar method
isvalid is a built-in method                                   % matlab.graphics.illustration.legend.LegendEntry method
isvalid is a built-in method                                   % matlab.graphics.illustration.legend.LegendIcon method
isvalid is a built-in method                                   % matlab.graphics.illustration.legend.ItemLayoutInfo method
isvalid is a built-in method                                   % matlab.graphics.interaction.graphicscontrol.InteractionObjects.DragObjectInteraction method
isvalid is a built-in method                                   % matlab.graphics.interaction.graphicscontrol.InteractionObjects.InteractionBase method
isvalid is a built-in method                                   % matlab.graphics.interaction.graphicscontrol.InteractionObjects.DragInteractionBase method
isvalid is a built-in method                                   % matlab.ui.internal.WebContextMenuController method
isvalid is a built-in method                                   % matlab.io.MatFile method
isvalid is a built-in method                                   % matlab.io.matfile.Properties method
isvalid is a built-in method                                   % matlab.graphics.controls.internal.ControlsGroup method
isvalid is a built-in method                                   % matlab.graphics.controls.internal.Backdrop method
isvalid is a built-in method                                   % matlab.internal.editor.SynchronousEvaluationOutputsService method
isvalid is a built-in method                                   % matlab.internal.editor.figure.ToolstripSubscriber method
isvalid is a built-in method                                   % matlab.internal.editor.figure.FigureSnapshotManager method
isvalid is a built-in method                                   % matlab.internal.debugger.DebugFileTranslator method
isvalid is a built-in method                                   % matlab.internal.editor.LastWarningGuard method
/MATLAB/toolbox/matlab/serial/@serial/isvalid.m                % serial method
/MATLAB/toolbox/ident/nlident/@idnlgrey/isvalid.m              % idnlgrey method
/MATLAB/toolbox/imaq/imaq/@imaqchild/isvalid.m                 % imaqchild method
/MATLAB/toolbox/imaq/imaq/@imaqdevice/isvalid.m                % imaqdevice method
/MATLAB/toolbox/instrument/instrument/@icgroup/isvalid.m       % icgroup method
/MATLAB/toolbox/mbc/mbclayouts/@xregcontainer/isvalid.m        % xregcontainer method
/MATLAB/toolbox/robust/rctobsolete/robust/@iconnect/isvalid.m  % iconnect method
/MATLAB/toolbox/shared/instrument/@instrument/isvalid.m        % instrument method
/MATLAB/toolbox/sl3d/sl3d/@vrfigure/isvalid.p                  % vrfigure method
/MATLAB/toolbox/sl3d/sl3d/@vrworld/isvalid.p                   % vrworld method
/MATLAB/toolbox/sl3d/sl3d/@vrnode/isvalid.p                    % vrnode method

[Walter Roberson]

When I use

help ishandle

on my system, the help is from the Instrument Control toolbox.

help has to pick out one of the help files. With isvalid instances all being class methods, there is no particular reason to guess that it should display the help for the handle class isvalid() .

You can get the help for the handle class version specifically by asking

help handle/ishandle

[marcel hendrix]

Note that in my screendump for 'help isvalid' there was no mention of other toolboxes where isvalid is valid.

I am on a different computer today but will carry out your 'which' hunt eventually.

[Paul]

According to 2023b help:

"If name appears in multiple folders on the MATLAB search path, help displays the help text for the first instance of name found on the search path.

If name is overloaded, help displays a link to a list of the methods with the same name."

Here on Answers we have

help isvalid

 isvalid - Determine whether instrument objects are valid
    This MATLAB function returns the logical array out, which contains a 0
    where the elements of obj are invalid instrument objects and a 1 where
    the elements of obj are valid instrument objects.

    Syntax
      out = isvalid(obj)

    See also clear, delete

    Introduced in Instrument Control Toolbox before R2006a
    Documentation for isvalid
       doc isvalid

    Other uses of isvalid

       handle/isvalid      idnlgrey/isvalid      instrument/isvalid
       icgroup/isvalid     imaqchild/isvalid     serial/isvalid
       iconnect/isvalid    imaqdevice/isvalid    xregcontainer/isvalid

Apparently the Instrument Control Toolbox is the first on the path. But we also see that

which isvalid

isvalid is a built-in method  % matlab.metadata.NamespaceList method

I thought which isvalid, which returns "the path of the first function or method found." would be consistent with the first item found by help.

Here we also see that help isvalid (Instrument Control) does return a list of "Other uses of invalid." (why doesn't that show StateFlow?).

However, I'm curious if the help for StateFlow/isvalid here on Answers shows the "Other uses" to compare with what's observed by @marcel hendrix that doesn't show "Other uses"

I wonder if the "Other uses" is automatically generated by the help command, or if it has to be manually implemented in the help text for each file, like is done with "See also", in which case it's possible the help text for StateFlow/isvalid may be missing that directive.

[marcel hendrix]

This is confusing (and starts to slightly undermine my faith in `help`). On MATLAB R2023b with many toolboxes (MATLAB, Simulink, Control Systems, ... Stateflow, Symbolic Math, System Identification, Wavelet) I see the following:

» help isvalid

--- help for Stateflow operator isvalid ---

 isvalid - Determine if message is valid
    isvalid(message_name) checks if an input or local message is valid.

    Syntax
      isvalid(message_name)

    See also discard, forward, receive

    Introduced in Stateflow in R2015b
    Documentation for isvalid
       doc isvalid
       

» help handle/isvalid

 ISVALID   Test handle validity.
    TF = ISVALID(H) performs an element-wise check for validity on the 
    handle elements of H.  The result is a logical array of the same 
    dimensions as H, where each element is the element-wise validity 
    result.
 
    A handle is invalid if it has been deleted or if it is an element
    of a handle array and has not yet been initialized.
 
    See also HANDLE, HANDLE/DELETE

    Documentation for handle/isvalid
       doc handle/isvalid

'which' confirms that isvalid is a built-in method, which does not explain the focus on Stateflow (which is neither the first nor the latest toolbox on the path).

which isvalid -all

isvalid is a built-in method                                                    % meta.PackageList method
isvalid is a built-in method                                                    % handle method
isvalid is a built-in method                                                    % meta.ClassList method
isvalid is a built-in method                                                    % meta.FunctionList method
isvalid is a built-in method                                                    % meta.TypeList method
isvalid is a built-in method                                                    % meta.EnumeratedValue method
isvalid is a built-in method                                                    % meta.MetaData method
isvalid is a built-in method                                                    % matlab.internal.language.ir_workspace_ownership_proxy method
isvalid is a built-in method                                                    % timer method
isvalid is a built-in method                                                    % matlab.internal.i18n.locale method
isvalid is a built-in method                                                    % matlabshared.supportpkg.internal.SupportPackageRootHandler method
isvalid is a built-in method                                                    % matlabshared.supportpkg.internal.SettingWriterReader method
isvalid is a built-in method                                                    % inputParser method
isvalid is a built-in method                                                    % matlabshared.supportpkg.internal.SingleRootHandler method
isvalid is a built-in method                                                    % internal.deviceplugindetection.Manager method
isvalid is a built-in method                                                    % internal.hotplug.EventSource method
isvalid is a built-in method                                                    % matlabshared.asyncio.internal.Channel method
isvalid is a built-in method                                                    % dynamicprops method
isvalid is a built-in method                                                    % matlab.mixin.Copyable method
isvalid is a built-in method                                                    % matlab.internal.language.localized_anonymous_function_handle_workspace_ownership_proxy method
isvalid is a built-in method                                                    % matlabshared.asyncio.internal.MessageHandler method
isvalid is a built-in method                                                    % asyncioimpl.Channel method
isvalid is a built-in method                                                    % asyncioimpl.InputStream method
isvalid is a built-in method                                                    % asyncioimpl.OutputStream method
isvalid is a built-in method                                                    % asyncioimpl.MessageHandler method
isvalid is a built-in method                                                    % matlabshared.asyncio.internal.InputStream method
isvalid is a built-in method                                                    % matlabshared.asyncio.internal.Stream method
isvalid is a built-in method                                                    % matlabshared.asyncio.internal.OutputStream method
isvalid is a built-in method                                                    % event.listener method
isvalid is a built-in method                                                    % connector.internal.Logger method
isvalid is a built-in method                                                    % meta.package method
isvalid is a built-in method                                                    % matlab.ui.eventdata.WindowMouseData method
isvalid is a built-in method                                                    % matlab.ui.internal.mixin.Printable method
isvalid is a built-in method                                                    % matlab.ui.internal.mixin.Windowable method
isvalid is a built-in method                                                    % matlab.ui.eventdata.WindowCloseRequestData method
isvalid is a built-in method                                                    % matlab.ui.Figure method
isvalid is a built-in method                                                    % matlab.ui.internal.mixin.AutoResizable method
isvalid is a built-in method                                                    % matlab.ui.internal.mixin.AxesLimits method
isvalid is a built-in method                                                    % matlab.ui.internal.mixin.Legacy method
isvalid is a built-in method                                                    % matlab.ui.internal.mixin.FontRenderable method
isvalid is a built-in method                                                    % matlab.ui.internal.mixin.KeyInvokable method
isvalid is a built-in method                                                    % matlab.ui.internal.mixin.ComponentLayoutable method
isvalid is a built-in method                                                    % matlab.ui.internal.mixin.NoMarginsUnitsOnlyPositionable method
isvalid is a built-in method                                                    % matlab.ui.eventdata.LocationChangedData method
isvalid is a built-in method                                                    % matlab.ui.eventdata.SizeChangedData method
isvalid is a built-in method                                                    % matlab.ui.internal.mixin.Positionable method
isvalid is a built-in method                                                    % matlab.ui.internal.mixin.OuterPositionable method
isvalid is a built-in method                                                    % matlab.ui.internal.mixin.UIOuterPositionable method
isvalid is a built-in method                                                    % matlab.ui.internal.mixin.Selectable method
isvalid is a built-in method                                                    % matlab.ui.internal.mixin.Scrollable method
isvalid is a built-in method                                                    % matlab.ui.internal.mixin.CanvasHostMixin method
isvalid is a built-in method                                                    % matlab.ui.internal.mixin.TerminalStateRepresentable method
isvalid is a built-in method                                                    % matlab.ui.Root method
isvalid is a built-in method                                                    % matlab.ui.control.ClientComponent method
isvalid is a built-in method                                                    % matlab.ui.control.Component method
isvalid is a built-in method                                                    % matlab.ui.container.Container method
isvalid is a built-in method                                                    % matlab.ui.container.CanvasContainer method
isvalid is a built-in method                                                    % matlab.ui.control.WebComponent method
isvalid is a built-in method                                                    % matlab.ui.container.internal.JavaWrapper method
isvalid is a built-in method                                                    % matlab.ui.container.internal.UIContainer method
isvalid is a built-in method                                                    % matlab.ui.control.UIControl method
isvalid is a built-in method                                                    % matlab.ui.container.ContextMenu method
isvalid is a built-in method                                                    % matlab.ui.container.Menu method
isvalid is a built-in method                                                    % matlab.ui.container.toolbar.PushTool method
isvalid is a built-in method                                                    % matlab.ui.container.toolbar.ToggleTool method
isvalid is a built-in method                                                    % matlab.ui.internal.mixin.UIToggleToolMixin method
isvalid is a built-in method                                                    % matlab.ui.internal.mixin.UIToolMixin method
isvalid is a built-in method                                                    % matlab.ui.container.Toolbar method
isvalid is a built-in method                                                    % matlab.ui.internal.UnitsService method
isvalid is a built-in method                                                    % matlab.ui.internal.UnitsServiceStorageInterface method
isvalid is a built-in method                                                    % matlab.ui.internal.UnitsServiceStorage method
isvalid is a built-in method                                                    % matlab.graphics.mixin.Focusable method
isvalid is a built-in method                                                    % matlab.graphics.internal.GraphicsUIProperties method
isvalid is a built-in method                                                    % matlab.graphics.internal.GraphicsCoreProperties method
isvalid is a built-in method                                                    % matlab.graphics.mixin.GraphicsPickable method
isvalid is a built-in method                                                    % matlab.graphics.mixin.Layoutable method
isvalid is a built-in method                                                    % matlab.graphics.mixin.ViewPropertiesManager method
isvalid is a built-in method                                                    % matlab.graphics.internal.Legacy method
isvalid is a built-in method                                                    % matlab.graphics.mixin.Mixin method
isvalid is a built-in method                                                    % matlab.graphics.mixin.NodeParent method
isvalid is a built-in method                                                    % matlab.graphics.eventdata.ChildData method
isvalid is a built-in method                                                    % matlab.graphics.mixin.NodeChildren method
isvalid is a built-in method                                                    % matlab.graphics.mixin.Pickable method
isvalid is a built-in method                                                    % matlab.graphics.mixin.Selectable method
isvalid is a built-in method                                                    % matlab.graphics.mixin.Themeable method
isvalid is a built-in method                                                    % matlab.graphics.mixin.ThemeContainer method
isvalid is a built-in method                                                    % matlab.graphics.internal.GraphicsJavaVisible method
isvalid is a built-in method                                                    % matlab.graphics.internal.GraphicsBaseFunctions method
isvalid is a built-in method                                                    % matlab.graphics.Graphics method
isvalid is a built-in method                                                    % matlab.graphics.GraphicsPlaceholder method
isvalid is a built-in method                                                    % matlab.graphics.mixin.internal.Copyable method
isvalid is a built-in method                                                    % matlab.graphics.internal.GraphicsPropertyHandler method
isvalid is a built-in method                                                    % matlab.graphics.internal.ReferenceObject method
isvalid is a built-in method                                                    % matlab.graphics.internal.GraphicsMetaProperty method
isvalid is a built-in method                                                    % matlab.graphics.internal.GraphicsMetaEvent method
isvalid is a built-in method                                                    % matlab.graphics.internal.GraphicsMetaClass method
isvalid is a built-in method                                                    % matlab.graphics.internal.Exportable method
isvalid is a built-in method                                                    % meta.class method
isvalid is a built-in method                                                    % matlab.mixin.SetGet method
isvalid is a built-in method                                                    % hgsetget method
isvalid is a built-in method                                                    % meta.property method
isvalid is a built-in method                                                    % meta.event method
isvalid is a built-in method                                                    % JavaVisible method
isvalid is a built-in method                                                    % matlab.mixin.internal.DefaultFactoryPropHandler method
isvalid is a built-in method                                                    % matlab.internal.language.introspective.NameResolver method
isvalid is a built-in method                                                    % matlab.internal.language.introspective.cache method
isvalid is a built-in method                                                    % containers.Map method
isvalid is a built-in method                                                    % matlab.settings.SettingsGroup method
isvalid is a built-in method                                                    % matlab.settings.Setting method
isvalid is a built-in method                                                    % matlab.desktop.editor.Document method
isvalid is a built-in method                                                    % matlab.desktop.editor.DocumentInterface method
isvalid is a built-in method                                                    % connector.internal.Future method
isvalid is a built-in method                                                    % connector.internal.Promise method
isvalid is a built-in method                                                    % matlab.desktop.editor.RtcEditorDocument method
isvalid is a built-in method                                                    % matlab.internal.language.nested_function_handle_ownership_proxy method
isvalid is a built-in method                                                    % message.internal.Subscription method
isvalid is a built-in method                                                    % onCleanup method
isvalid is a built-in method                                                    % slreq.app.MainManager method
isvalid is a built-in method                                                    % slreq.data.ReqData method
isvalid is a built-in method                                                    % rmimap.StorageMapper method
isvalid is a built-in method                                                    % matlab.internal.WeakHandle method
isvalid is a built-in method                                                    % event.EventData method
isvalid is a built-in method                                                    % matlab.internal.language.ExecutionTracker method
isvalid is a built-in method                                                    % FileWrapper__ method
isvalid is a built-in method                                                    % matlab.ui.internal.dialog.DialogUtils method
isvalid is a built-in method                                                    % matlab.graphics.eventdata.MouseData method
isvalid is a built-in method                                                    % matlab.graphics.eventdata.Update method
isvalid is a built-in method                                                    % matlab.graphics.axis.AbstractAxes method
isvalid is a built-in method                                                    % matlab.graphics.axis.Axes method
isvalid is a built-in method                                                    % matlab.graphics.axis.decorator.AxisDecoration method
isvalid is a built-in method                                                    % matlab.graphics.axis.decorator.AxisRulerBase method
isvalid is a built-in method                                                    % matlab.graphics.axis.decorator.Backdrop method
isvalid is a built-in method                                                    % matlab.graphics.axis.decorator.BoxFrame method
isvalid is a built-in method                                                    % matlab.graphics.axis.dataspace.CartesianDataSpace method
isvalid is a built-in method                                                    % matlab.graphics.axis.colorspace.ColorSpace method
isvalid is a built-in method                                                    % matlab.graphics.axis.dataspace.DataSpace method
isvalid is a built-in method                                                    % matlab.graphics.axis.decorator.DecorationContainer method
isvalid is a built-in method                                                    % matlab.graphics.axis.decorator.Grid method
isvalid is a built-in method                                                    % matlab.graphics.axis.HintConsumer method
isvalid is a built-in method                                                    % matlab.graphics.axis.colorspace.MapColorSpace method
isvalid is a built-in method                                                    % matlab.graphics.axis.decorator.NumericRuler method
isvalid is a built-in method                                                    % matlab.graphics.axis.PlotTarget method
isvalid is a built-in method                                                    % matlab.graphics.axis.PlotTargetManager method
isvalid is a built-in method                                                    % matlab.graphics.axis.decorator.Ruler method
isvalid is a built-in method                                                    % matlab.graphics.axis.decorator.ScalableAxisRuler method
isvalid is a built-in method                                                    % matlab.graphics.axis.decorator.SimpleGrid method
isvalid is a built-in method                                                    % matlab.graphics.axis.camera.Camera method
isvalid is a built-in method                                                    % matlab.graphics.axis.camera.Camera2D method
isvalid is a built-in method                                                    % matlab.graphics.axis.camera.Camera3D method
isvalid is a built-in method                                                    % matlab.graphics.primitive.Marker method
isvalid is a built-in method                                                    % matlab.graphics.primitive.Rectangle method
isvalid is a built-in method                                                    % matlab.graphics.primitive.Text method
isvalid is a built-in method                                                    % matlab.graphics.layout.TiledChartLayout method
isvalid is a built-in method                                                    % matlab.graphics.layout.Layout method
isvalid is a built-in method                                                    % matlab.graphics.layout.Text method
isvalid is a built-in method                                                    % matlab.graphics.mixin.AbstractAxesParentable method
isvalid is a built-in method                                                    % matlab.graphics.mixin.AffectAutoLimitsMixin method
isvalid is a built-in method                                                    % matlab.graphics.mixin.AxesParentable method
isvalid is a built-in method                                                    % matlab.graphics.mixin.Background method
isvalid is a built-in method                                                    % matlab.graphics.mixin.ChartLayoutable method
isvalid is a built-in method                                                    % matlab.graphics.mixin.LegendTarget method
isvalid is a built-in method                                                    % matlab.graphics.mixin.Legendable method
isvalid is a built-in method                                                    % matlab.graphics.mixin.ColorOrderUser method
isvalid is a built-in method                                                    % matlab.graphics.mixin.PolarAxesParentable method
isvalid is a built-in method                                                    % matlab.graphics.mixin.GeographicAxesParentable method
isvalid is a built-in method                                                    % matlab.graphics.mixin.MapAxesParentable method
isvalid is a built-in method                                                    % matlab.graphics.mixin.SceneNodeGroup method
isvalid is a built-in method                                                    % matlab.graphics.mixin.UIParentable method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.BackdropPrimitive method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.BoxPrimitive method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.ClipNode method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.Geometry method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.GridPrimitive method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.LightSource method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.LineLoop method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.LineStrip method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.Marker method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.CompositeMarker method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.PrimitiveBase method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.PrimitiveContainer method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.Quadrilateral method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.RulerPrimitive method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.Text method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.TriangleStrip method
isvalid is a built-in method                                                    % matlab.graphics.eventdata.UpdateState method
isvalid is a built-in method                                                    % matlab.graphics.primitive.Data method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.Group method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.GroupBase method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.Positionable method
isvalid is a built-in method                                                    % matlab.graphics.primitive.Group method
isvalid is a built-in method                                                    % matlab.graphics.primitive.Transform method
isvalid is a built-in method                                                    % matlab.graphics.primitive.world.SceneNode method
isvalid is a built-in method                                                    % matlab.graphics.axis.colorspace.ColorsIterator method
isvalid is a built-in method                                                    % matlab.graphics.axis.colorspace.IndexColorsIterator method
isvalid is a built-in method                                                    % matlab.graphics.axis.dataspace.IndexPointsIterator method
isvalid is a built-in method                                                    % matlab.graphics.axis.dataspace.PointsIterator method
isvalid is a built-in method                                                    % matlab.graphics.axis.colorspace.internal.ProxyColorsIterator method
isvalid is a built-in method                                                    % matlab.graphics.axis.dataspace.XYZPointsIterator method
isvalid is a built-in method                                                    % matlab.graphics.eventdata.PostUpdate method
isvalid is a built-in method                                                    % matlab.graphics.primitive.canvas.Canvas method
isvalid is a built-in method                                                    % matlab.graphics.primitive.canvas.CanvasFactory method
isvalid is a built-in method                                                    % matlab.graphics.interaction.interactioncontainers.CartesianAxesInteractionContainer method
isvalid is a built-in method                                                    % matlab.graphics.interaction.interactioncontainers.StandardAxesInteractionContainer method
isvalid is a built-in method                                                    % matlab.graphics.interaction.interactioncontainers.BaseAxesInteractionContainer method
isvalid is a built-in method                                                    % matlab.graphics.interaction.interactioncontainers.InteractionContainer method
isvalid is a built-in method                                                    % matlab.graphics.primitive.canvas.JavaCanvasFactory method
isvalid is a built-in method                                                    % matlab.graphics.primitive.canvas.JavaCanvas method
isvalid is a built-in method                                                    % matlab.graphics.internal.CanvasSetup method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.ScribeStackManager method
isvalid is a built-in method                                                    % matlab.graphics.chart.interaction.DataAnnotatable method
isvalid is a built-in method                                                    % matlab.graphics.mixin.DataProperties method
isvalid is a built-in method                                                    % matlab.graphics.chart.primitive.Line method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.ScribeLayer method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.AnnotationPane method
isvalid is a built-in method                                                    % matlab.graphics.controls.internal.ToolbarFactory method
isvalid is a built-in method                                                    % matlab.graphics.controls.DesktopToolbarController method
isvalid is a built-in method                                                    % matlab.graphics.controls.internal.ToolbarValidator method
isvalid is a built-in method                                                    % matlab.graphics.controls.ToolbarController method
isvalid is a built-in method                                                    % matlab.graphics.controls.internal.PointerMixin method
isvalid is a built-in method                                                    % matlab.graphics.controls.internal.FigureBasedModeStrategy method
isvalid is a built-in method                                                    % matlab.graphics.controls.internal.AbstractModeStrategy method
isvalid is a built-in method                                                    % matlab.graphics.controls.internal.FigurePointerModeStrategy method
isvalid is a built-in method                                                    % matlab.graphics.controls.internal.PointerModeStrategy method
isvalid is a built-in method                                                    % matlab.graphics.controls.internal.PostUpdatePlugin method
isvalid is a built-in method                                                    % matlab.graphics.eventdata.ChildEventData method
isvalid is a built-in method                                                    % matlab.graphics.interaction.interactioncontainers.TextInteractionContainer method
isvalid is a built-in method                                                    % matlab.graphics.interaction.internal.UnifiedAxesInteractions method
isvalid is a built-in method                                                    % matlab.internal.editor.figure.FigureUtils method
isvalid is a built-in method                                                    % meta.DynamicProperty method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.EditInteraction method
isvalid is a built-in method                                                    % event.proplistener method
isvalid is a built-in method                                                    % matlab.graphics.interaction.internal.InteractionsList method
isvalid is a built-in method                                                    % matlab.graphics.interaction.graphicscontrol.ControlManager method
isvalid is a built-in method                                                    % matlab.graphics.interaction.internal.TextInteractions method
isvalid is a built-in method                                                    % event.ChildEvent method
isvalid is a built-in method                                                    % matlab.graphics.chart.ChartInputParser method
isvalid is a built-in method                                                    % matlab.graphics.chart.internal.ChartInputParserBase method
isvalid is a built-in method                                                    % matlab.graphics.chart.internal.ParserNode method
isvalid is a built-in method                                                    % matlab.graphics.internal.export.GraphicsExportable method
isvalid is a built-in method                                                    % meta.Validation method
isvalid is a built-in method                                                    % matlab.uitools.internal.uimodemanager method
isvalid is a built-in method                                                    % matlab.uitools.internal.uimode method
isvalid is a built-in method                                                    % matlab.mixin.SetGetExactNames method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.DataCursorManager method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.PointDataCursor method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.FigurePanel method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.PointDataTip method
isvalid is a built-in method                                                    % event.PropertyEvent method
isvalid is a built-in method                                                    % matlab.graphics.internal.LinkProp method
isvalid is a built-in method                                                    % matlab.graphics.internal.LinkAxes method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.Button method
isvalid is a built-in method                                                    % matlab.graphics.controls.internal.Control method
isvalid is a built-in method                                                    % matlab.graphics.internal.DataCursorBehavior method
isvalid is a built-in method                                                    % matlab.graphics.internal.HGBehavior method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.ButtonImage method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.image.IconView method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.image.ImageSource method
isvalid is a built-in method                                                    % matlab.ui.controls.ToolbarPushButton method
isvalid is a built-in method                                                    % matlab.graphics.controls.AxesToolbarButton method
isvalid is a built-in method                                                    % matlab.graphics.controls.internal.ToolTipMixin method
isvalid is a built-in method                                                    % matlab.graphics.controls.internal.ToolbarButtonRegistry method
isvalid is a built-in method                                                    % matlab.ui.controls.ToolbarStateButton method
isvalid is a built-in method                                                    % matlab.graphics.controls.eventdata.ProcessInteractionsEventData method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.DefaultAxesInteractionStrategy method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.InteractionStrategy method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.ScrollZoom method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.SingleActionZoom method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.InteractionBase method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.LimitInteractionBase method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.ScrollEvent method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.InteractionEvent method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.DataTipProvider method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.DatatipsClick method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.DataTipsBase method
isvalid is a built-in method                                                    % matlab.ui.internal.PositionUtils method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.DatatipsHoverLinger method
isvalid is a built-in method                                                    % matlab.graphics.interaction.actions.Linger method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.ClickEvent method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.KeyListener method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.Pan3D method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.UnconstrainedPan method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.PanBase method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.Drag method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.DragSingleton method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.RulerPan method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.AxisPan method
isvalid is a built-in method                                                    % matlab.graphics.interaction.actions.LingerEventData method
isvalid is a built-in method                                                    % matlab.graphics.interaction.uiaxes.MouseEventData method
isvalid is a built-in method                                                    % matlab.internal.timer.TimerInfo method
isvalid is a built-in method                                                    % matlab.ui.controls.AxesToolbar method
isvalid is a built-in method                                                    % matlab.graphics.controls.AxesToolbar method
isvalid is a built-in method                                                    % matlab.graphics.controls.internal.FadeGroup method
isvalid is a built-in method                                                    % matlab.graphics.controls.internal.ControlsGroup method
isvalid is a built-in method                                                    % matlab.graphics.controls.internal.Backdrop method
isvalid is a built-in method                                                    % matlab.graphics.internal.PrintBehavior method
isvalid is a built-in method                                                    % matlab.ui.controls.ToolbarDropdown method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.image.IconDropdownView method
isvalid is a built-in method                                                    % matlab.graphics.controls.internal.ModeListener method
isvalid is a built-in method                                                    % matlab.graphics.controls.internal.ZoomDirectionListener method
isvalid is a built-in method                                                    % matlab.desktop.editor.JavaEditorDocument method
isvalid is a built-in method                                                    % matlab.internal.editor.FigureManager method
isvalid is a built-in method                                                    % matlab.internal.editor.VariableManager method
isvalid is a built-in method                                                    % internal.matlab.variableeditor.peer.VEFactory method
isvalid is a built-in method                                                    % matlab.internal.editor.figure.FigurePoolManager method
isvalid is a built-in method                                                    % matlab.internal.editor.figure.ToolstripSubscriber method
isvalid is a built-in method                                                    % matlab.graphics.chart.primitive.Stair method
isvalid is a built-in method                                                    % brushing.select method
isvalid is a built-in method                                                    % matlab.graphics.chart.interaction.dataannotatable.LineHelper method
isvalid is a built-in method                                                    % matlab.graphics.chart.interaction.dataannotatable.picking.AnnotatablePicker method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.GraphicsTip method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.TipInfo method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.TextFormatHelper method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.ScribeHost method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.ScribePeer method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.PointTipLocator method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.TipLocator method
isvalid is a built-in method                                                    % matlab.graphics.chart.interaction.dataannotatable.internal.CoordinateData method
isvalid is a built-in method                                                    % matlab.graphics.datatip.DataTipTemplate method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.PointDataTipController method
isvalid is a built-in method                                                    % matlab.graphics.shape.internal.DataTipController method
isvalid is a built-in method                                                    % matlab.graphics.datatip.DataTip method
isvalid is a built-in method                                                    % matlab.graphics.chart.interaction.dataannotatable.DataDescriptor method
isvalid is a built-in method                                                    % matlab.codeanalyzerreport.internal.Server method
isvalid is a built-in method                                                    % mf.zero.Model method
isvalid is a built-in method                                                    % mf.zero.ModelElement method
isvalid is a built-in method                                                    % mf.zero.PrimitiveSet method
isvalid is a built-in method                                                    % mf.zero.PrimitiveSequence method
isvalid is a built-in method                                                    % mf.zero.Transaction method
isvalid is a built-in method                                                    % mf.zero.Event method
isvalid is a built-in method                                                    % mf.zero.EventRegistration method
isvalid is a built-in method                                                    % mf.zero.io.SynchronizationChannel method
isvalid is a built-in method                                                    % mf.zero.io.ConnectorChannelMS method
isvalid is a built-in method                                                    % mf.zero.io.ModelSynchronizer method
isvalid is a built-in method                                                    % matlab.codeanalyzer.internal.datamodel.MessagesModel method
isvalid is a built-in method                                                    % matlab.codeanalyzer.internal.datamodel.StatusModel method
isvalid is a built-in method                                                    % matlab.internal.web.WebCommandBrowserLauncher method
isvalid is a built-in method                                                    % matlab.internal.web.WebCommandNotifier method
isvalid is a built-in method                                                    % matlab.internal.doc.services.DocLocation method
isvalid is a built-in method                                                    % matlab.internal.doc.services.DocSettings method
isvalid is a built-in method                                                    % connector.internal.Worker method
isvalid is a built-in method                                                    % matlab.internal.web.BrowserEventData method
isvalid is a built-in method                                                    % matlab.internal.cef.webwindow method
isvalid is a built-in method                                                    % matlab.internal.help.helpProcess method
isvalid is a built-in method                                                    % matlab.internal.doc.services.DocLanguage method
isvalid is a built-in method                                                    % matlab.io.internal.meta.FunctionInterfaceMetaProperty method
isvalid is a built-in method                                                    % matlab.io.internal.meta.FunctionInterfaceMetaClass method
isvalid is a built-in method                                                    % matlab.io.internal.validators.ArgumentParser method
isvalid is a built-in method                                                    % matlab.internal.doc.ui.DocPageNotifier method
isvalid is a built-in method                                                    % matlab.internal.doc.ui.DocPageEventData method
isvalid is a built-in method                                                    % matlab.internal.webservices.HTTPConnector method
isvalid is a built-in method                                                    % matlab.internal.webservices.HTTPConnectionAdapter method
isvalid is a built-in method                                                    % matlab.net.http.internal.ProgressReporter method
isvalid is a built-in method                                                    % matlab.net.http.io.ContentProvider method
isvalid is a built-in method                                                    % matlab.net.http.io.ContentConsumer method
isvalid is a built-in method                                                    % matlab.internal.language.introspective.classWrapper.rawMCOS method
isvalid is a built-in method                                                    % matlab.internal.language.introspective.classWrapper.MCOS method
isvalid is a built-in method                                                    % matlab.internal.language.introspective.classWrapper.base method
isvalid is a built-in method                                                    % matlab.internal.language.introspective.classWrapper.raw method
isvalid is a built-in method                                                    % meta.method method
isvalid is a built-in method                                                    % matlab.internal.language.introspective.MCOSMetaResolver method
isvalid is a built-in method                                                    % matlab.internal.help.Lookfor method
isvalid is a built-in method                                                    % matlab.internal.codeanalyzer.inputParser method
isvalid is a built-in method                                                    % matlab.internal.codeanalyzer.returnMessageStruct method
isvalid is a built-in method                                                    % matlab.internal.codeanalyzer.outputMsg method
isvalid is a built-in method                                                    % matlab.internal.language.introspective.classInformation.fileMethod method
isvalid is a built-in method                                                    % matlab.internal.language.introspective.classInformation.method method
isvalid is a built-in method                                                    % matlab.internal.language.introspective.classInformation.classElement method
isvalid is a built-in method                                                    % matlab.internal.language.introspective.classInformation.classItem method
isvalid is a built-in method                                                    % matlab.internal.language.introspective.classInformation.base method
D:\Program Files\MATLAB\R2023b\toolbox\matlab\lang\@handle\isvalid.m            % handle method
D:\Program Files\MATLAB\R2023b\toolbox\matlab\serial\@serial\isvalid.m          % serial method
D:\Program Files\MATLAB\R2023b\toolbox\ident\nlident\@idnlgrey\isvalid.m        % idnlgrey method
D:\Program Files\MATLAB\R2023b\toolbox\shared\instrument\@instrument\isvalid.m  % instrument method
D:\Program Files\MATLAB\R2023b\toolbox\sl3d\sl3d\@vrfigure\isvalid.m            % vrfigure method
D:\Program Files\MATLAB\R2023b\toolbox\sl3d\sl3d\@vrnode\isvalid.m              % vrnode method
D:\Program Files\MATLAB\R2023b\toolbox\sl3d\sl3d\@vrworld\isvalid.m             % vrworld method

[Paul]

Here on Answers, type isvalid, and dbtype isvalid, display the same file, but not the same file as either which or help. However, those respective doc pages don't specify what happens if there are multiple choices, so the behavior is undocumented but not necessarily wrong.

I'm really surprised by all of this.

And I'm really confused by ....

Generate the help for whatever help finds first:

help isvalid

 isvalid - Determine whether instrument objects are valid
    This MATLAB function returns the logical array out, which contains a 0
    where the elements of obj are invalid instrument objects and a 1 where
    the elements of obj are valid instrument objects.

    Syntax
      out = isvalid(obj)

    See also clear, delete

    Introduced in Instrument Control Toolbox before R2006a
    Documentation for isvalid
       doc isvalid

    Other uses of isvalid

       handle/isvalid      idnlgrey/isvalid      instrument/isvalid
       icgroup/isvalid     imaqchild/isvalid     serial/isvalid
       iconnect/isvalid    imaqdevice/isvalid    xregcontainer/isvalid

Here's my attempt to find the same file that help finds by iterating over everything returned from which and looking for some of the help text.

w = which('isvalid','-all');
for ii = 1:numel(w)
    h = help(w{ii});
    if contains(h,'Introduced in Instrument Control Toolbox','IgnoreCase',true)
        w{ii}
    elseif contains(h,'the elements of obj are invalid instrument objects','IgnoreCase',true)
        w{ii}
    end
end

Nothing found. How is that possible?

Two items in w seem to be related to the Instrument Control Toolbox, but neither have the same help as shown above.

ii = find(contains(w,'instrument','IgnoreCase',true));
help(w{ii(1)})

 ISVALID True for instrument or device group objects that can be connected to instrument.
 
    OUT = ISVALID(OBJ) returns a logical array, OUT, that contains a 0 
    where the elements of OBJ are deleted objects and a 1 where the
    elements of OBJ are valid objects. OBJ can be a instrument object, 
    device group object, an array of instrument objects or an array of
    device group objects.
 
    An invalid object (an object that has been deleted) cannot be connected
    to an instrument. An invalid object should be cleared from the
    workspace with CLEAR.
 
    Example:
        % Create a valid GPIB object.
        g = gpib('ni', 0, 1);
        out1 = isvalid(g)
 
        % Delete the GPIB object and make it invalid.
        delete(g)
        out2 = isvalid(g)
 
    See also INSTRHELP.

help(w{ii(2)})

 ISVALID True for instrument or device group objects that can be connected to instrument.
 
    OUT = ISVALID(OBJ) returns a logical array, OUT, that contains a 0 
    where the elements of OBJ are deleted objects and a 1 where the
    elements of OBJ are valid objects. OBJ can be a instrument object, 
    device group object, an array of instrument objects or an array of
    device group objects.
 
    An invalid object (an object that has been deleted) cannot be connected
    to an instrument. An invalid object should be cleared from the
    workspace with CLEAR.
 
    Example:
        % Create a valid GPIB object.
        g = gpib('ni', 0, 1);
        out1 = isvalid(g)
 
        % Delete the GPIB object and make it invalid.
        delete(g)
        out2 = isvalid(g)
 
    See also INSTRHELP.

    Documentation for instrument/isvalid
       doc instrument/isvalid

So how can I determine the exact file from which the result of 'help isvalid' is generated?