How to control the pushbutton in a while loop in Matlab GUI

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Hi all,
I am now writting a pushbutton callback function by using a while loop like below
while i > 0 ;
var = get(handles. pushbutton, ' value');
if var ==1
plot(x,y);
else
error('range quitting')
end;
end
However, by this way, the pushbutton will automatically be clicked and the while loop will run continously.
I would like to run the loop each time only when I click the pushbutton.
Can anyone help me to solve the problem?
Many thanks.

Accepted Answer

Adam Danz
Adam Danz on 17 Aug 2021
> I would like to run the loop each time only when I click the pushbutton.
I don't know whether you're using app designer, GUIDE, or a custom GUI/App which prevents me from getting too specific. I'm not sure what this means: " the pushbutton will automatically be clicked". Also, where is this while-loop and what is i? It's not clear why a while-loop is needed.
Here the general steps you can take.
  1. If the button should produce a figure, assign a callback function to the button and move the plotting code to the callback function. The code will be evoked when the user pressed the button.
  2. If the button should start/stop a longer plotting process such as an animation or updating a plot according to incoming data, you could use a state button (on/off states) that determines when the plotting should happen or pause. Keep in mind that when a callback function completes, its variables are cleared so you'll have to store the progress somewhere so the plotting function can pick up where it left off next time it's evoked.
  7 Comments
Adam Danz
Adam Danz on 18 Aug 2021
I have no idea how the lines are created but their handles need to be stored somehwere within the app. Since I don't know whether you're using app designer or something else, I can't suggest a specific method (use a private property for app designer, use guidata with GUIDE, use setappdata otherwise).
If the button merely deletes 1 line every time it's pressed, you'll just access the list of handles and delete the first or last handle depending on whether you want to delete the most recent or earliest lines.
I really can't give any more specific advice without knowing a lot more about what the actual goal is.
Alan
Alan on 18 Aug 2021
Thanks for your suggestions and help. Some of your advices are useful to solve the probelm. Thanks a lot.

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