Using parfor with a 3d array

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oceanmod 2021-2-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/735172-using-parfor-with-a-3d-array

评论： oceanmod 2021-2-3

I am trying to update a 3d array within a parfor loop. The actual code is too messy to reproduce here but the snippet of code below conveys what I am trying to do (but unable to).

a = zeros(5,5,10):
parfor t = 1:ntimes;
  temp = randn(5,5); % In my actual code, this is some meaningful quantity that depends on the loop variable 't'
  for k = 1:10;
     a(:,:,k) = a(:,:,k) + randn(5,5); 
  end
end

I get an error saying matlab is unable to classiy the variable 'a'.

Is there a way I can fix this?

Thanks!

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回答（1 个）

Matt J 2021-2-3

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/735172-using-parfor-with-a-3d-array#answer_613972

A variable in a parfor loop must belong to one of 5 categories. I cannot tell from your simplified example which category a is supposed to belong to (and neither can parfor), but the table here should help you decide:

https://www.mathworks.com/help/coder/ug/classification-of-variables-in-parfor-loops.html