Variable in PARFOR

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rahman
rahman 2011-7-26
Hi
I have a loop in my code for calculating a matrix that index of matrix, determined in loop. for example:
for ii=1:100
pos=find(A==ii);
.
.
.
Z(:,pos)=Z(:,pos)+...
.
.
.
end
which A is another matrix. When I try to use PARFOR, an error occured for variable pos. I read PARFOR help in matlab, but I didn't get any idea how can I correct that. can anyone help me to write correct code for PARFOR?

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回答（2 个）

Walter Roberson
Walter Roberson 2011-7-26
Including the error message would help.
My speculation is that the analyzer is not able to determine that you are "slicing" Z in non-overlapping ways.
If so, then I do not know enough about PARFOR to be able to suggest a work-around.
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Walter Roberson
Walter Roberson 2011-7-26
Are you initializing Z outside of the loop? Is the value of Z needed after the loop?
rahman
rahman 2011-7-26
Yes. Befor loop started I initialized Z=zeros(N).
Yes. I use Z after loop

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Konrad Malkowski
Konrad Malkowski 2011-8-3
What are you trying to do with Z variable? Do you use it to accumulate some values (reduction variable) across all iterations? Or, do you update a single column of Z in each iteration? I would need more information on this loop and variable in order to help you.

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