Key press in MATLAB
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I have a main script in MATLAB in which I am calling four different functions each has been defined in a separate script.
function[] = main()
[par_1] =function_1(inp_1);
[par_2] = function_2(inp_2);
[par_3] = function_3(inp_3);
end
Now I want to define here that while for example function_1 is being called and is running, by pressing a key, for example 'esc', function_1 stops and return and function_2 starts running and so on. I don't know how to do this in MATLAB.
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Walter Roberson
2017-1-11
0 个投票
In MATLAB, you can only do that with the cooperation of the function itself. You would define a callback such as a figure WindowKeyPressFcn callback, that would set a "key was pressed!" flag in a common space, and the functions being run would have to periodically check whether the flag was set and voluntarily exit if it found the flag set.
5 个评论
Nick Matin
2017-1-11
Walter Roberson
2017-1-12
It is not an event listener, it is a Figure property. The ability to listen to keypresses is associated with figures in MATLAB.
set(gcf, 'Windowkeypressfcn', @(src, event) set(src, 'UserData' true) )
Then when the cooperating routine starts, it should
set(gcf, 'UserData', false); %reset key-has-been-pressed
And assuming it is in a loop, from time to time it should
drawnow(); %give the graphics queue a chance to process the callback
if get(gcf, 'UserData') %was key pressed?
%the user pressed a key. Gracefully exit the loop
break;
end
Nick Matin
2017-1-12
Thomas
2019-9-4
Need a comma after that first line's 'UserData'
Walter Roberson
2019-9-5
You are correct, Thomas, it should have been
set(gcf, 'Windowkeypressfcn', @(src, event) set(src, 'UserData', true) )
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