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Matlab App Designer: Update plot during loop in a function

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Nikolas Dehler
Nikolas Dehler on 20 Dec 2019
Commented: Evgin Ün on 6 Apr 2020
The function I use is the callback function of a button. My issue is that when I execute a loop in the callback function, the plots in the UI Figure don´t update during the loop, but only show the last state after the loop is finished. I´d like to see the changing plot during the while loop in the UI Figure. Is this even possible, or do I have to add other functions, etc.?

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Accepted Answer

Allen
Allen on 20 Dec 2019
Assuming that your plot function is part of the while loop and you have the hold off, then you might try using pause and/or drawnow.
while condition
...
plot( ... )
drawnow(axes_handle)
pause(0.5)
...
end

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Evgin Ün
Evgin Ün on 24 Mar 2020
Hi Nikolas,
i have the same problem. I'd like to see the changing plot during the loop, too. Can you post your code for the plot here. That would be very cool.
Thank you.
Nikolas Dehler
Nikolas Dehler on 25 Mar 2020
% that´s not the comlete code. I hope it´s sufficient for you.
function startupFcn(app) % I think you only need this if you want to see something in your plot before pushing the button.
scatter(app.UIAxes2,app.x,app.y); % x and y are vectors
hold(app.UIAxes2,'on');
end
function startButtonPushed(app, event)
while app.i < app.number
% calculation of app.cd
plot(app.UIAxes,app.i,app.cd);
hold(app.UIAxes,'on');
% you could plot anything this way. With the drawnow function, it will update continuously.
app.i = app.i+1;
hold(app.UIAxes2,'off');
scatter(app.UIAxes2,app.x,app.y);
hold(app.UIAxes2,'on');
drawnow
end
end

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