How do I exit a loop with a key hit?

Question

Harry 2013-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/80775-how-do-i-exit-a-loop-with-a-key-hit

评论： Lorenzo 2024-11-14

So I have a loop in my code but I want to exit the loop and move onto the next set of calculations after I hit some key. I know that I could ask for input in the loop, which could confirm whether I could move on or not but that would require me to confirm at each loop which I don't want to be doing.

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Answer 1

Lukas 2020-1-22

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在 MATLAB Online 中打开

In a similar way I use wait bat cancel button:

hWaitbar = waitbar(0, 'Iteration 1', 'Name', 'Solving problem','CreateCancelBtn','delete(gcbf)');
for i=1:5
    % Some long taking computation
    pause(5);
    % Check
    drawnow;
    if ~ishandle(hWaitbar)
        % Stop the if cancel button was pressed
        disp('Stopped by user');
        break;
    else
        % Update the wait bar
        waitbar(i/5,hWaitbar, ['Iteration ' num2str(i)]);
    end
end

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Sanders A. 2020-2-5

I prefer this answer because it doesn't latch on to an existing figure and upon hitting the cancel/'stop now' button delete the figure. This si nice for being able to leave my figures in specific places on my screen and run&stop my animations as I please.

Thank you!!

Lorenzo 2024-11-14

excellent! Thank you

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Answer 2

Vugar 2018-9-30

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https://ww2.mathworks.cn/matlabcentral/answers/80775-how-do-i-exit-a-loop-with-a-key-hit#answer_339095

The answer of Jan is almost correct - only one code line is missing:

ButtonHandle = uicontrol('Style', 'PushButton', ...
                         'String', 'Stop loop', ...
                         'Callback', 'delete(gcbf)');
for k = 1:1e6
  disp(k)
  if ~ishandle(ButtonHandle)
    disp('Loop stopped by user');
    break;
  end
pause(0.01); % A NEW LINE
end

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Answer 3

Jan 2013-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/80775-how-do-i-exit-a-loop-with-a-key-hit#answer_90478

编辑：Jan 2013-7-1

在 MATLAB Online 中打开

You can create a waitbar or any other GUI which contains a button for breaking the loop. Then check a property inside the loop and break is the value chnages. This property could be the existence of the figure or the button as well as the UserData of the button or figure.

ButtonHandle = uicontrol('Style', 'PushButton', ...
                         'String', 'Stop loop', ...
                         'Callback', 'delete(gcbf)');
for k = 1:1e6
  disp(k)
  if ~ishandle(ButtonHandle)
    disp('Loop stopped by user');
    break;
  end
end

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Rik 2019-8-5

S. Gokhun Tanyer, what is the exact code you tried?

Christopher Bitikofer 2022-12-23

clarifying point. the uicontrol function tries to draw on the current figure, When I didn't have one open it didn't instantiate its own figure. I setup the following code to initialize the uibutton on an independant figure.

breakLoopFigure = figure('color','w','Name','Plotter');

breakLoopFigure.Position = [1325 612 560 420];

breakLoopFigure.Visible = "on";

breakLoopFigure.Units = "normalized";

ButtonHandle = uicontrol(breakLoopFigure,...

'Style','pushbutton',...

'String', 'Stop loop', ...

'Callback', 'delete(gcbf)');

ButtonHandle.Units = "normalized";

ButtonHandle.Position = [.1 .1 .8 .8];

drawnow

This works quite well for my purpose, but you could just as easily place the button on an app gui or a plot with other data. Others have pointed out the waitbar also works well.

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