The parfor loop cannot be run due to the way variable 'J' is used

Question

Jamais avenir 2015-3-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/181533-the-parfor-loop-cannot-be-run-due-to-the-way-variable-j-is-used

评论： Stephen23 2015-3-5

采纳的回答： Matt J

在 MATLAB Online 中打开

I am receiving the following error in using parfor. Is there any way to use Parfor for here?

The parfor loop cannot be run due to the way variable 'J' is used

parfor xpop = 1:Xpop
Gxm = (X(xpop,M:Nvar)-0.5*ones(1,K)) * (X(xpop,M:Nvar)-0.5*ones(1,K))';
Cos = cos(X(xpop,1:M-1)*pi/2);
J(xpop,1) = prod(Cos)*(1+Gxm);
for nobj = 1:M-1
 J(xpop,nobj+1) = (J(xpop,1)/prod(Cos(1,M-nobj:M-1)))...
     * sin(X(xpop,M-nobj)*pi/2);
end
  end*

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Stephen23 2015-3-5

http://www.mathworks.com/help/matlab/matlab_prog/vectorization.html

http://www.mathworks.com/help/matlab/matlab_prog/techniques-for-improving-performance.html

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Answer 1

Matt J 2015-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/181533-the-parfor-loop-cannot-be-run-due-to-the-way-variable-j-is-used#answer_170081

编辑：Matt J 2015-3-4

在 MATLAB Online 中打开

There is, but it seems terribly unnecessary. Everything you are currently attempting to do with parfor is abundantly vectorizable,

    xpop=1:Xpop;
    Gxm=sum((X(xpop,M:Nvar)-.5).^2,2);
    Cos = cos(X(xpop,1:M-1)*pi/2);
    tmp1=prod(Cos,2).*(1+Gxm);
    tmp2=tmp1./prod(Cos(1,M-nobj:M-1));    
    J(xpop,1:M)=[tmp1, bsxfun(@times,tmp2, sin(X(xpop,M-1:-1:1)*pi/2) )];