How to fix an error in Parallel Processing?

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Benson Gou 2019-8-31

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https://ww2.mathworks.cn/matlabcentral/answers/478341-how-to-fix-an-error-in-parallel-processing

评论： Walter Roberson 2019-9-4

Dear All,

When I tried to use parfor to run my code, I always got the following error message (I defined the variable "red" at different places but still got this error message):

"An UndefinedFunction error was thrown on the workers for 'red'. This might be because the file containing 'red' is not accessible on the workers. Use addAttachedFiles(pool, files) to specify the required files to be attached. For more information see the documentation for 'parallel.Pool/addAttachedFiles'.

Caused by:

Undefined function or variable 'red'."

It is weird for me because I tried to define "red" at different place but still cannot fix this problem. Thanks a lot for your great help in advance.

Best regards,

Benson

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Benson Gou 2019-9-4

在 MATLAB Online 中打开

Hello, Walter,

Here is the code of for interation whih is a part of my big code. All variables are correct except "red" which is defined as follows:

red = setdiff([1:length(Ind_mixMI)],tree);
atop = zeros(length(res0), mD);
Flag = zeros(1,mD);
flag = 0;
parfor i = 1 : mD
    indrow = lineIndOfftree(i);
    deltaHbr = sparse(zeros(length(tree),Nbus));
    deltaHrr = sparse(zeros(lengthred,Nbus));
    allrowHbr = find(sum(DHbr')>0);
    allrowHrr = find(sum(DHrr')>0);
    indHbr = [DHbr(indrow,[rowinHbr1 indinbranch1 sign1]);DHbr(indrow,[rowinHbr2 indinbranch2 sign2])];
    indHrr = [DHrr(indrow,[rowinHrr1 indinbranch1 sign1]);DHrr(indrow,[rowinHrr2 indinbranch2 sign2])];
    [~,rowlocalHbr] = find(DHbr(indrow,[rowinHbr1 rowinHbr2]));
    [~,rowlocalHrr] = find(DHrr(indrow,[rowinHbr1 rowinHrr2]));
    deltaHbr(indHbr(rowlocalHbr,1),:) = Yf(indHbr(rowlocalHbr,2),IndBus).*indHbr(rowlocalHbr,3);
    deltaHrr(indHrr(rowlocalHrr,1),:) = Yf(indHrr(rowlocalHrr,2),IndBus).*indHrr(rowlocalHrr,3);
    
    U = []; V = []; flagUpdateSTop = []; pos = []; flagInvHbrupdate = []; i0 = []; Uncheckline = [];
    if nnz(deltaHbr) > 0
        tic
        res = zeros(lengthred,1);
        [res, vtemp, Uncheckline] = func1(Haltmr0, Haltm0, U, V, deltaHbr, deltaHrr, Ind_mixM0, Ind_mixMI0, S0, tree, IndBus, v, res, InvHbr0, flagUpdateSTop, WideBlock, pos, flagInvHbrupdate, vgroup, Uncheckline, i0);
        toc
        
        deltares = -res0+res;
        [eee, fff] = find(isnan(deltares));
        if ~isempty(eee)
            deltares = zeros(length(deltares),1);
        end
        Atoptemp = deltares;
        [eee, fff] = find(isnan(Atoptemp));
    else
        Ires = conj(S0(red)./v0(Ind_mixM0(red,1)))-(Haltmr(red,:)+deltaHrr)*v0(IndBus);
        deltares = -deltaHrr*v0(IndBus);
        Atoptemp = conj(deltares).*v0(Ind_mixM0(red,1));
    end
    atop(:,i) = Atoptemp;   
end

Benson Gou 2019-9-4

I did not copy all the codes in here. S0 and Ind_mixM0 are defined and used in my code. These two variables are key variables and used from the beginning to te end.

Thanks.

Benson

Walter Roberson 2019-9-4

If you cannot post your actual code here, then I think you will need to open a support case. (Which might be needed anyhow, as the solution might not be obvious to the outside volunteers.)

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