how to interrupt a while loop??

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IPSAS
IPSAS on 6 Jun 2012
Commented: Danilo Teran on 10 May 2017
in GUI, I try to interrupt a while loop...let's say.. a program initiate while loop when button A are pushed, and i want to stop/interupt the loop by pushing button B.. any idea????

Accepted Answer

Walter Roberson
Walter Roberson on 6 Jun 2012
You cannot do that.
The closest you can get is to have button B set a variable in a place that the code in button A can reach, with that code checking the value periodically. For example,
Button B:
set(handles.buttonA, 'UserData', 'stop');
Button A:
set(handles.buttonA, 'Userdata', []);
while ....
curval = get(handles.buttonA, 'UserData');
if ~isempty(curval) && strcmp(curval, 'stop')
break;
end
....
end
  4 Comments
Image Analyst
Image Analyst on 13 Apr 2013
Walter might want to add this to the FAQ. It's useful and asked fairly often, but I don't think it's on there yet. By the way, you can also do it with a checkbox. Button A makes the "Finish Now" checkbox become visible and clears it. When the user checks the box, the loop will "break" because it gets the checkbox value and checks to see if it's checked.
Danilo Teran
Danilo Teran on 10 May 2017
Hi I did your suggestion, but I can never stop routine on Pushbutton A. Shall I do something extra in PushburronB

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More Answers (1)

Geoff
Geoff on 6 Jun 2012
In your GUI, set some user data to your GUI handle.
In your loop, check this data and break accordingly.

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