Parfor and cell array

Question

Michael 2014-10-21

0
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https://ww2.mathworks.cn/matlabcentral/answers/159568-parfor-and-cell-array

回答： Michael 2014-10-21

Suppose I have the following code
p = cell(1,3);
w = zeros(5,3);
p{1} = X; 2 by 2 matrix
p{2} = Y;  2 by 2 matrix
p{3} = Z;  2 by 2 matrix
 parfor k=1:3
   for i=1:5
    w(i,k) = somefunction(variable1, variable2,p{k})
   end
 end

If I remove the parfor, the code runs fine, but if I use the parfor I get the error: Output argument "XXXX" from some other function that is used in "somefunction" was not assigned during call.

Sorry for being very schematic but the actual code is very long has and uses numerous functions.

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Answer 1

José-Luis 2014-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/159568-parfor-and-cell-array#answer_156097

在 MATLAB Online 中打开

It works for me:

p = cell(1,3);
w = zeros(5,3);
p{1} = rand(2);
p{2} = rand(2);
p{3} = rand(2);
myFun = @(x,y,z) x + y + sum(z(:));
variable1 = 1;
variable2 = 2;
 parfor k=1:3
   for i=1:5
    w(i,k) = myFun(variable1, variable2,p{k})
   end
 end

I'm afraid you'll have to provide more details about variable1, variable2 and somefunction()

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Answer 2

Michael 2014-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/159568-parfor-and-cell-array#answer_156105

Figured it out, a portion of the workers were working with variables p{k} that had a defective input. The matrices were not Hermitian and the code only works if they are. Running each iteration separately helped.