parfor error with 3D matrix

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sunny kant
sunny kant 2022-1-30
评论： Matt J 2022-1-31
Hello everyone,
I am using the parfor loop for the 3D matrix. When I am executing my parfor loop and getting this error "Error: The variable TEST1 in a parfor cannot be classified. See Parallel for Loops in MATLAB, "Overview". I am replacing the zero value with nan in the loop. Any suggestion regarding this. Your help in this regard will be highly appreciated.
data = rand (20,10,10);
data1 = rand (20,10,10);
parfor ii=1:20
ii
for jj=1:10
jj
TEST1 (ii,jj,:) = data(ii,jj,:).*data1 (ii,jj,:);
TEST1 (TEST1==0) = nan;
end
end

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采纳的回答

Matt J
Matt J 2022-1-30
Move that line outside the loop.
parfor ii=1:20
ii
for jj=1:10
jj
TEST1 (ii,jj,:) = data(ii,jj,:).*data1 (ii,jj,:);
end
end
TEST1 (TEST1==0) = nan;

更多回答（1 个）

sunny kant
sunny kant 2022-1-31
Thanks you Matt for your suggestion on the code. However, I am applied the same thing, but when I am applying TES1 (TEST1==0) = nan inside the parfor loop in the code, it gives error. Can you suggest me that why it is happing.
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Matt J
Matt J 2022-1-31
编辑：Matt J 2022-1-31
Additionally
TEST1 (TEST1==0) = nan;
is an operation that Matlab already does in a fast, parallelized manner without explicit loops. You should reserve parfor only for things that cannot easily be replaced with vectorized expressions.
Matt J
Matt J 2022-1-31
sunny kant's comment moved here
Thanks Walter for explaining me why my code is not working. As you suggested, I appllied for my code, and now it is working. Thanks for your suggestion on my code and clearing my doubts.

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