Implementing a stop button in AppDesigner

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Faker Mayfield
Faker Mayfield 2020-1-15
编辑： jmore 2020-8-25
Currently, I have a run and stop button implemented in AppDesigner. When I click the run button, it runs another script on the PATH. When I click the stop button, I'd like it to find the running script and halt it from proceeding, whereever it currently is. Is there a way to track the PID of a .m script file currently running?

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Guillaume
Guillaume 2020-1-15
PIDs are used by the OS to track executables. m scripts don't have PIDS they're run within a matlab executable. Assuming the m script is run by a different matlab session as the one running your App, you could kill that separate matlab. Otherwise, no matlab does not let you kill scripts.
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Faker Mayfield
Faker Mayfield 2020-1-17
Thanks for the responses!
In AppDesigner, there is an export button, which takes the .mlapp file and exports it to a .m file. By main method, I was referencing the start of my app that begins to kick off calculations.
Yes, it indeed becomes unresponsive when running long calculations, thanks for that point on pause. So, would running another instance of MATLAB in the background and communicating GUI responses via UDP/TCP resolve this or is the Parallel Computing Toolbox really the way to go?
Guillaume
Guillaume 2020-1-17
If you have the parallel toolbox, it would be the easiest method. However, I can't help with that I don't have the toolbox.
Without the toolbox, my approach would be to modify the processing function so that it periodically checks if it needs to stop (and give a chance for the UI to process the events).
Otherwise, indeed you're left with implementing your own multithreading. Yair has written an excellent series on the different solutions. Starts at: Explicit multi threading - part 1 but for you, part 4 is probably the most relevant.

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jmore
jmore 2020-8-25
编辑：jmore 2020-8-25
You can get around not having the parallel computing toolbox by adding a pause(0) (not sure how this works, but it does).
function stopSim(app, event)
app.stop_sim = true;
end
while i<=100 && app.stop_sim == false
pause(0);
% do something until user pushes the stopSim button
end
Once the user pushes the stopSim button, for which function "stopSim" is a callback, then the app has enough time to fetch the updated propertie of the app, to app.stop_sim == true and hence it is able to terminate the while loop before reaching 100 iterations.

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