Parfor error with bsxfun

Question

Cem 2014-7-9

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/141123-parfor-error-with-bsxfun

编辑： Matt J 2014-7-9

Dear all,

I'm having a weird issue with using parfor and bsxfun. I provide a minimal working example below (tried on both 2011b and 2013a). The version with for is working fine, whereas if I switch to parfor, I receive the 'non-singleton dimensions must match' error for bsxfun. I'm not sure if this was already answered although I looked for possible related questions&answers. Thanks in advance.

Cem

var1=repmat((1:1000)',2,3);
var2=ones(1000,1000);
var3=ones(6000,1);
temporary_var=bsxfun(@times,var2(var1,:),var3);
result=zeros(1000,1000);
for i=1:1000
    result(i,:)=sum(bsxfun(@times,var2(var1,i),temporary_var));
end

Note: the issue persists both matlabpools open and closed.

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Answer 1

Jill Reese 2014-7-9

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https://ww2.mathworks.cn/matlabcentral/answers/141123-parfor-error-with-bsxfun#answer_144348

在 MATLAB Online 中打开

I think that the parfor analysis is getting a bit confused by the multidimensional indexing into var2. If you re-write the code as follows it should work:

var1=repmat((1:1000)',2,3);
var2=ones(1000,1000);
var3=ones(6000,1);
temporary_var=bsxfun(@times,var2(var1,:),var3);
result=zeros(1000,1000);
tmp = var2(var1,:);
parfor i=1:1000
    result(i,:)=sum(bsxfun(@times,tmp(:,i),temporary_var));
end