Unclassified variables in a parfor loop

Question

oceanmod 2020-3-16

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/511212-unclassified-variables-in-a-parfor-loop

评论： Matt J 2020-3-17

I am trying to do something like the following:

parfor i= xystart:xyend
    ....
    xycount = i - xystart + 1;
    A = zeros(nx,ny); B = A;
    
    for n=1:Nn;
        for m=1:Mm;
            A(m,n)= <some expression>;
            B(m,n)= <some expression>;
        end
    end
    C(xycount,:,:) = A. * B;
    
end 

I am getting an error message saying that 'C' is an unclassified variable. The above snippet is not the actual code which is quite big. But I hope the lines above convey what am I trying to do. Any idea what am I doing wrong?

Thanks!

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Mohammad Sami 2020-3-17

Try initializing variable C before calling the parfor loop.

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Answer 1

Matt J 2020-3-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/511212-unclassified-variables-in-a-parfor-loop#answer_420452

在 MATLAB Online 中打开

parfor i= 1:xyend-xystart+1
    ....
   
    A = zeros(nx,ny); B = A;
    
    for n=1:Nn;
        for m=1:Mm;
            A(m,n)= <some expression>;
            B(m,n)= <some expression>;
        end
    end
    C(i,:,:) = A. * B;
    
end 