Matlab App Designer: Update plot during loop in a function

Question

Nikolas Dehler 2019-12-20

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评论： Evgin Ün 2020-4-6

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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Answer 1

Allen 2019-12-20

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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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Nikolas Dehler 2020-3-25

编辑：Nikolas Dehler 2020-3-25

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% 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