matrix index in Parfor loop

Question

rahman 2015-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/171643-matrix-index-in-parfor-loop

编辑： Matt J 2015-1-25

Hi all. for code I write below, I want to use Parfor but MATLAB report an Error for definition t(s):ts(s)+a as the index of matrix b. Does anyone have any Idea help me ?

 for s=1:e
   b( s, t(s):ts(s)+a ) = ...
 end

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Answer 1

Matt J 2015-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/171643-matrix-index-in-parfor-loop#answer_165880

编辑：Matt J 2015-1-25

在 MATLAB Online 中打开

You must first pre-align the data vectors b( s, t(s):ts(s)+a ) into the columns of a matrix B. That way, parfor can see that the data pieces are parallel across s and can slice them,

    t=t(:).'; %row
    s=(1:e);
    T=bsxfun(@plus, t(1:e),(0:a).');
    S=repmat((1:e),a+1,1);    
    idx=sub2ind(size(b), S,T);
    B=b(idx);
     parfor s=1:e
        B(:,s)= ...
     end
     b(idx)=B;