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Wen
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Problems when running GUI graph plotting with 'while' or 'if' loops

Asked by Wen
on 28 Jul 2019
Latest activity Commented on by Wen
on 29 Jul 2019
Hi, I am doing a GUI plotting, trying to implement a real-time plot. I use 'if' loop for different conditions with the pushbutton callback, but when 'if' loop is used, there is error and the other conditions will not execute. So, I use 'while' loop instead and it works. The problem is, when the 'while' loop is used, the command inside the 'while' loop cannot run normally as the conditions keep refreshing by the loop. Can anyone help me?
My function looks like this, inside a pushbutton callback:
if hObject.String=='Start'
set(handles.pushbutton1,'String','Pause');
for i=1:end
plot(x);
end
end
while hObject.String=='Pause' % when 'if' is used here, the plot won't stop plotting
set(handles.pushbutton1,'String','Cont.');
plot(x(1:i));
% at here I want to select and highlight data, since 'while' loop is running, the dragged plot will return to the 'while' loop place and the datatip unable to be selected.
end
while hObject.String=='Cont.'
set(handles.pushbutton1,'String','Pause');
j=i;
for i=j:end
plot(x);
end
end

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1 Answer

Answer by Rik
on 29 Jul 2019
 Accepted Answer

You should be using strcmp to test if a char array is equal to another char array. Your current tests are array operations.
Also, if is not a loop. The only ways to start a loop is with while, for, and parfor.
A final note: two of your loops just repeat the same code without any dependancy on the loop variable. Why are you using a loop at all there? Unless x is a function, you should use the pause function to stop plotting for a moment.

  1 Comment

Thanks for your suggestions, I already did it. Thank you.

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