How to continue the script while using the system()- command?

Question

Sophie96 2022-5-6

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https://ww2.mathworks.cn/matlabcentral/answers/1712955-how-to-continue-the-script-while-using-the-system-command

评论： Riccardo Scorretti 2022-5-6

I am starting a python-script out of Matlab using the system()-command.

I would to check in a while loop if the script is still running and do something else while running. If it is not running anymore, I would like to break the while-loop and continue my Matlab script. However, it seems that the while loop starts when I already closed the python-script and not while the script is still running:

checkpython = 'pgrep python';

system('unset LD_LIBRARY_PATH;python3 MyPythonScript.py')

[status1,~] = system(checkpython);

while status1==0

[status,~] = system(checkpython);

%%% Doing something else here %%%

if status == 1

disp('Python closed')

break

end

How could I check while the python script is running if it is still running and do something else in that while-loop?

Thanks for your advice!

Best, Sophie

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Riccardo Scorretti 2022-5-6

In order to continue the execution of MATLAB while running the pyhton script, you could add an ampersand (&) to the end of the command.

As for checking if your python script terminated the execution, I cannot figure out any elegant solution. The "quick and dirty" method could be to make your script open a dummy file at the beginning, and delete it when he finishes; so you can check if the script is still running by checking the existance of that particular file.

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