How to fix an error in Parallel Processing?

2019 8 31
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更新时间：2019 9 4
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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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Walter Roberson
Walter Roberson 2019-8-31
parfor might be thinking that red is a function instead of a variable. Thta can especially occur if you "poofed" red into existance by defining it in a script, or you used load() without an output argument to define red
Benson Gou
Benson Gou 2019-9-3
Hello, Walter, Thanks for your great help. In my code "red" is just a regular variable and I defined it at the beginning of the code.
Would you please tell me how to define it in a script?
Thanks a lot again.
Benson
Walter Roberson
Walter Roberson 2019-9-3
I suspect we will need to see your code.
Benson Gou
Benson Gou 2019-9-4
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
Walter Roberson
Walter Roberson 2019-9-4
S0 and Ind_MixM0 are not assigned to in this code. That implies that S0(red) and Ind_MixM0(red, 1) can be precalculated and assigned to variables, and then red would not be needed inside the loop.
Benson Gou
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
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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