How to break out of a while loop inside a function block ?

Question

Prashanth Krishnan 2015-7-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/231516-how-to-break-out-of-a-while-loop-inside-a-function-block

评论： Camile van der Heijden 2018-3-1

I'm trying to break out of a while loop when a key is pressed and I've achieved this through the following code snippet -

 keep = 1; 
 h = figure('KeyPressFcn','keep=0');
 while keep
  pause(0.01)
 end
 close(h)

I need to incorporate this into a GUI. But when this exact same code snippet is inserted into a function block, I'm no longer able to break out of the loop. Here's a code for the same -

 function calibrate()
 keep = 1;
 h = figure('KeyPressFcn','keep=0');
 while keep
  pause(0.01)
 end
 close(h)

How do I get this to work ?

Thanks !

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Muthu Annamalai 2015-7-28

Please use {} Code editor feature to make your code more readable to others.

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Answer 1

Jon 2015-7-28

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https://ww2.mathworks.cn/matlabcentral/answers/231516-how-to-break-out-of-a-while-loop-inside-a-function-block#answer_187488

编辑：Jon 2015-7-28

The search function is your friend. See https://ch.mathworks.com/matlabcentral/newsreader/view_thread/315080 for someone with the same problem, and an explanation and solution.

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Prashanth Krishnan 2015-7-28

Thanks Jon! This worked like a dream.

Camile van der Heijden 2018-3-1

Unfortunately, the newsreader link Jon referred to is no longer available. I would love to know what it said though. Does it involve using flag variables?

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Answer 2

Muthu Annamalai 2015-7-28

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/231516-how-to-break-out-of-a-while-loop-inside-a-function-block#answer_187485

编辑：Muthu Annamalai 2015-7-28

在 MATLAB Online 中打开

Changing your code to,

       keep = true;
       h = figure('KeyPressFcn',@() keep= ~keep ); 
       while keep 
          pause(0.01) 
          sprintf('keep = %d',keep);
       end 
       close(h)