Stackedplot error when changing position and plotting again

2024 6 7
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更新时间：2024 6 9
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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

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Adam Danz
Adam Danz 2024-6-7
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
Christof 2024-6-7
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
dpb 2024-6-7
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
Christof 2024-6-9
编辑：Christof 2024-6-9
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!

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 采纳的回答

dpb
dpb 2024-6-7
编辑：dpb 2024-6-7
Ran in:

0 个投票

Ran in:
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!!!

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Christof
Christof 2024-6-7
编辑：Christof 2024-6-7
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
dpb 2024-6-7
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
Christof 2024-6-9
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 ^^

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