Unrecognized function using PDE toolbox

Hello,

I am trying to run the exact code from this example:

https://www.mathworks.com/help/pde/ug/magnetic-flux-density-in-electromagnet.html

But I get an error for unrecognized function 'addCell'. I have the PDE toolbox installed (checked using ver command).

I am able to plot and use functions like 'createpde' as in this example:

https://www.mathworks.com/help/pde/ug/multicylinder.html

So I'm not sure why the 'addCell' function is not working. I appreciate any help on this.

[DGM]

I don't have PDE toolbox or a new enough version, but this should be the relevant tool

https://www.mathworks.com/help/pde/ug/discretegeometry.addcell.html

introduced in R2021a

As to why it's not showing up, I don't know.

Answer 1

[Steven Lord]

According to the addCell documentation page, the input arguments you pass into addCell must be a "3-D geometry, specified as a DiscreteGeometry object."

Are you calling addCell with two DiscreteGeometry objects or are you trying to call it with something else like a numeric array? If the latter, that won't work.

[Ghufran Aldawood]

Hello, thank you for your response. Here is the code used:

coreGm = multicylinder(0.03,0.1);
coilGm = multicylinder([0.05 0.07],0.2,"Void",[1 0]);
airGm = multicylinder(1,2);
coreGm = translate(coreGm,[0 0 1.025]);
coilGm = translate(coilGm,[0 0 0.9]);
gm = addCell(airGm,coreGm);
gm = addCell(gm,coilGm);

It uses discrete geometry of a cylinder.

[Steven Lord]

coreGm = multicylinder(0.03,0.1);
coilGm = multicylinder([0.05 0.07],0.2,"Void",[1 0]);
airGm = multicylinder(1,2);
coreGm = translate(coreGm,[0 0 1.025]);
coilGm = translate(coilGm,[0 0 0.9]);
gm = addCell(airGm,coreGm);
gm = addCell(gm,coilGm)

gm = 
  DiscreteGeometry with properties:

       NumCells: 3
       NumFaces: 10
       NumEdges: 8
    NumVertices: 8
       Vertices: [8×3 double]

Can you set a breakpoint on the line with the first addCell call and execute the following command when MATLAB stops at the breakpoint, or can you add the command immediately before that call?

whos

  Name        Size            Bytes  Class                   Attributes

  airGm       1x1                 8  pde.DiscreteGeometry              
  cmdout      1x33               66  char                              
  coilGm      1x1                 8  pde.DiscreteGeometry              
  coreGm      1x1                 8  pde.DiscreteGeometry              
  gm          1x1                 8  pde.DiscreteGeometry              

I want to see what classes airGm, coreGm, and coilGm are. I'm curious if you have a multicylinder or translate function that's somehow taking precedence over the ones in Partial Differential Equations Toolbox and those functions are causing one of those variables not to be what you expect. While you're at it, seeing the output of these commands might be useful too.

which -all multicylinder

built-in (/MATLAB/toolbox/pde/multicylinder)

which -all translate

/MATLAB/toolbox/stateflow/stateflow/private/translate.m  % Private to stateflow
/MATLAB/toolbox/matlab/polyfun/@polyshape/translate.m    % Shadowed polyshape method
translate is a built-in method                           % Shadowed matlab.graphics.primitive.Transform method
translate is a Java method                               % Shadowed com.mathworks.mde.liveeditor.debug.LiveEditorDebugEventTranslator method
translate is a Java method                               % Shadowed com.mathworks.mlservices.MatlabDebugServices$DebugEventTranslator method
translate is a built-in method                           % Shadowed pde.DiscreteGeometry method

which -all addCell

addCell is a built-in method  % pde.DiscreteGeometry method