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data assingment issue in parfor loop

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Yu Li
Yu Li 2023-5-10
评论： Yu Li 2023-5-10
Hi:
I tried to assign matrix to pre-allocated variable "A" in "parfor" loop but failed, error message says: "Error: Unable to classify the variable 'A' in the body of the parfor-loop. For more information, see Parallel for Loops in MATLAB, "Solve Variable Classification Issues in parfor-Loops"
the technical issue I'm facing is that, the "numberIdx" is a variable that needs to be determined inside the for-loop, i.e. it is not a fixed value.
is there any way to improve my script?
Thanks!
A=ones(10,10);
parfor idx=1:1:10
numberIdx=2:2:8;
A(idx,numberIdx)=0;
end

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采纳的回答

Walter Roberson
Walter Roberson 2023-5-10
A=ones(10,10);
parfor idx=1:1:10
Arow = A(idx, :) ;
numberIdx=2:2:8;
Arow(numberIdx)=0;
A(idx, :) = Arow;
end
Yes, you copy some existing elements of A "needlessly", but this programming pattern is easy for matlab to prove will work without problems.

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