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Break loop with button click Appdesigner GUI [Both plot and button are in different callback functions]

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shubham kumar gupta
shubham kumar gupta on 23 Nov 2020
Commented: Jan on 7 Dec 2020
I have a GUI MATLAB
I have a button
and there is a loop like this
function RUN()
t=1:0.01:3600;
for i=1:numel(t)
y(1,i)=readValue();
plot(t(1:i),Tco(1:i));
pause(0.02)
end
end
function BUTTON_PRESS()
%BREAK FROM THAT LOOP
end
I want to break this loop when I click my button

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Accepted Answer

Jan
Jan on 24 Nov 2020
Edited: Jan on 24 Nov 2020
function main
FigH = figure;
ButtonH = uicontrol(FigH, 'Style', 'PushButton', 'String', 'Stop',
'Callback', @ButtonPressed, 'UserData', 0);
RUN(ButtonH);
end
function ButtnPressed(ButtonH, EventData)
ButtonH.UserData = 1;
end
function RUN(ButtonH)
t = 1:0.01:3600;
for i = 1:numel(t)
y(1,i) = readValue();
plot(t(1:i), Tco(1:i));
pause(0.02);
if ButtonH.UserData
break;
end
end
end
If there is really no chance to obtain a clean providing of the button's handle, use the tag to find it dynamically - but this is less nice:
function main
FigH = figure;
ButtonH = uicontrol(FigH, 'Style', 'PushButton', 'String', 'Stop', ...
'Callback', @ButtonPressed, 'UserData', 0, ...
'Tag', 'myUniqueButtonTag_in: main.m');
RUN();
end
function ButtnPressed(ButtonH, EventData)
ButtonH.UserData = 1;
end
function RUN()
ButtonH = findobj(allchild(groot), 'Tag', 'myUniqueButtonTag_in: main.m');
... same as above
end
Care for the situation, where two figures are existing or none, e.g. by:
function RUN()
ButtonH = findobj(allchild(groot), 'Tag', 'myUniqueButtonTag_in: main.m');
if numel(ButtonH) > 1
warning('Multiple stop buttons found.')
end
...
if ~isempty(ButtonH) && any([ButtonH.UserData])
end

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shubham kumar gupta
shubham kumar gupta on 2 Dec 2020
cool solved I increased the pause time!! :) but Thats what actually happens when I click Breakpoints stop
Somehow It working!

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More Answers (1)

Benjamin
Benjamin on 23 Nov 2020
You can define a variable that says whether the button has been clicked. Set the value of that variable in your button's callback function. Check the value of that variable on each iteration of your for loop, and if it says the button has been clicked, break out of the loop.

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Rik
Rik on 24 Nov 2020
Do not use a global. It is much better to share data through guidata or by making them nested functions. You can even set the flag value as the UserData of a GUI element.
All other functions can access and overwrite global variable contents. Especially with such a short name as flag this risk is non-zero. If you really insist on using global variable, make the name as long as you can: include the function name and include a long description. You have 63 characters, use them.
global RUN_PLOT_GUI___flag_to_stop_plotting_loop_if_true
shubham kumar gupta
shubham kumar gupta on 1 Dec 2020
NO HELPED!! Tried unable to stop loop even changing the name flag to RUN_PLOT_GUI___flag_to_stop_plotting_loop_if_true!!
Rik
Rik on 1 Dec 2020
Changing the name will not solve anything if your code is not working in the first place. It is a good habit.
Instead of holding down the shift button while typing on this forum (which is considered SHOUTING and impolite), did you try using breakpoints to debug your code?

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