Can a system() Command be used Inside a Function Called from Inside a parfor Loop?

Question

Paul 2024-9-12

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2152425-can-a-system-command-be-used-inside-a-function-called-from-inside-a-parfor-loop

回答： Epsilon 2024-9-13

Is the following code allowed:

result = zeros(100,1);
parfor ii = 1:100
   
    % do something
    result(ii) = myfun(resultfromdoingsomething)
end
function result = myfun(inp)
    % do something and write a file based on inp
    status = system(command);  % command executes an executable that reads in the file that was written and produces an output file
    result = % read in the file produced by the executable and grab a value to return
    % delete the files
end

Even if allowed, are there any risks to be concerned about?

Would also like to know if there are any differences between 2024a and 2019b in this regard.

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Answer 1

Epsilon 2024-9-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2152425-can-a-system-command-be-used-inside-a-function-called-from-inside-a-parfor-loop#answer_1515850

在 MATLAB Online 中打开

Hi Paul,

A 'system' command inside a function called from within ‘parfor’ seems to be working fine.

Code:

function myFunction(index) 
command = sprintf('echo Processing index %d', index); 
[~, cmdout] = system(command); 
disp(['Output for index ', num2str(index), ': ', cmdout]); 
end 
parfor i = 1:100
    myFunction(i); 
end 
Output for index 100: Processing index 100

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