Matlab App Designer: Update plot during loop in a function

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.?

Answer 1

[Allen]

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

[Nikolas Dehler]

Thanks, it worked immediatly the way I wanted it.

[Evgin Ün]

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]

% 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

[Evgin Ün]

Thank you very much Nikolas!