Incompatible indexing of variable for parfor

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Hari 2022-9-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1812330-incompatible-indexing-of-variable-for-parfor

回答： Edric Ellis 2022-9-27

I have a variable Network which is a cell array of size 5x12. Each cell is 76x1 double. Inside the parfor loop, in every iteration I need to use portions of the variable of size 5x3. This gives me a warning in the parfor that the variable is indexed in a way incompatible for the loop.

Here is a glimpse of my code. Can anybody suggest ways to modify the variable so that it can be made compatible with parfor loop

parfor j=1:4
        sample=Network(:,(2*j)+(j-2):((2*j)+j);
        ........
end

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Hari 2022-9-27

在 MATLAB Online 中打开

The result for the code is here. I am not sure what overlapping refers to, but I think there is no overlap here. Correct me if I am wrong

for j=1:4
        (2*j)+(j-2):((2*j)+j)
end
ans = 1×3
     1     2     3
ans = 1×3
     4     5     6
ans = 1×3
     7     8     9
ans = 1×3
    10    11    12

Bruno Luong 2022-9-27

在 MATLAB Online 中打开

Then reshape your array in 3D

Networkr = reshape(Network, size(Nerworks,1), 3, []);

then use parforloop on the third dimension.

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回答（1 个）

Edric Ellis 2022-9-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1812330-incompatible-indexing-of-variable-for-parfor#answer_1061645

The total size in bytes of Network is 5*12*76*8 = 36480. That is tiny. Ignore the parfor "broadcast" warning - that is intended to alert you when you might accidentally be sending gigabytes to each worker. It is irrelevant in this case.