Stackedplot error when changing position and plotting again

Hello together,

I get an error with stackedplot, when changing position (which works always the first time) and plotting then again, adding new variables. Without the position change, there is no error and I can plot on.

That's the code I use. Without the "Position" line it works fine all the time. With the position change I get an error (below code).

app.Logs(app.Log).Stack{1} = stackedplot(app.Logs(app.Log).Table, app.Logs(app.Log).ToPlot,'Parent',app.StackedTab);

for e=1:+1:height(app.Logs(app.Log).Stack{1}.DisplayLabels)

emptyLabels(e,1) = ""; % Create empty string for label

end

if app.Logs(app.Log).Plots > 0

app.Logs(app.Log).Stack{1}.DisplayLabels = emptyLabels; % "Delete labels"

app.Logs(app.Log).Stack{1}.Position = [0.05,0.05,0.90,0.90]; % Get rid of the broad margin

end

Thats the error:

Error using stackedplot (line 100)

Brace indexing is not supported for variables of this type.

Error in LogReader/DataButtonPress (line 141)

app.Logs(app.Log).Stack{1} =

stackedplot(app.Logs(app.Log).Table,

app.Logs(app.Log).ToPlot,'Parent',app.StackedTab);

Error in LogReader>@(varargin)app.DataButtonPress(varargin{:}) (line 336)

app.Logs(app.Log).Variables{2, i}.ValueChangedFcn =

@app.DataButtonPress; %Callback function

Error using matlab.ui.control.internal.controller.ComponentController/executeUserCallback (line 429)

Error while evaluating StateButton PrivateValueChangedFcn.

What am I not understanding? ^^

Thanks in advance!

Christof

[Adam Danz]

Is app.Logs(app.Log).Stack initialized before the first line? Is app.Logs(app.Log).Stack overwritten somewhere else in your code?

Does the ValueChangedFcn plot a new stackedplot every time it's evoked?

[Christof]

Thank you very much Adam!

Yes, the function plotted a new stackedplot. I thought, just overwriting it would be sufficient. But your hint helped! I just needed to delete the stackedplot before. And no, I didn't initialise the variable before. I still don't.

This works:

try

delete(app.Logs(app.Log).Stack{1});

catch

end

app.Logs(app.Log).Stack{1} = stackedplot(app.Logs(app.Log).Table, app.Logs(app.Log).ToPlot,'Parent',app.StackedTab);

for e=1:+1:height(app.Logs(app.Log).Stack{1}.DisplayLabels)

emptyLabels(e,1) = "";

end

if app.Logs(app.Log).Plots > 0

app.Logs(app.Log).Stack{1}.DisplayLabels = emptyLabels;

app.Logs(app.Log).Stack{1}.Position = [0.05,0.05,0.90,0.90];

end

[dpb]

If it works, all's well, but it surely looks like way overkill on nested referencing...

for e=1:+1:height(app.Logs(app.Log).Stack{1}.DisplayLabels)
   emptyLabels(e,1) = "";
end

can be written as

emptyLabels=strings(size(app.Logs(app.Log).Stack{1}.DisplayLabels));

[Christof]

Hello dpb,

I'm not experienced in programming, especially in Matlab. My approach of this nested referencing is, to load one complete "Log" in one structure, so I can save and control all elements for the plot. When loading a log, over 500 elements are created dynamically - buttons, edit fields, plots etc. The number of elements can vary from Log to log. That's the way, I saw as "reasonable" with my knowledge so far.

But at least this "nested referencing" is not important for my stackedplot, because I create it each time dynamically and don't need to save it's properties, when loading the next log.

Thanks for the empty labels :) Nice function to create "nothing".

Have a good day!

Answer 1

[dpb]

stackedplot

tP=readtable("patients.xls","TextType","string");
hSP=stackedplot(tP,["Height","Weight","Systolic","Diastolic"]);

figure
vars=["Height","Weight","Systolic","Diastolic"];
hSP=stackedplot(tP,vars,'DisplayLabels',strings(size(vars)),'Position',[0.05,0.10,0.90,0.90]);

Get rid of the nested indexing of variables with cells...it's trying to dereference a non-cell object with the curlies that is the syntax problem...don't do that!!!

[Christof]

Thank you very much for your approach dpb. I tried it, but still didn't get the result wished. The stackedplot plotted just over the "old" one. I guess, my question wasn't specific enough ^^

[dpb]

We can't run your app, but the approach shown will work if you save the figure and axis handles and reference them correctly.

The problem in your code is owing to the {} trying to dereference objects but it's not possible in isolation to see just what you're trying to do.

[Christof]

With or without {} it didn't work properly. I had to delete the stackedplot first, as I wrote.

Now it still works with {}. I will remove them, as soon, as I am finished. At least the {} give me the possibility to look into the variables. Or I am understanding something wrong ^^