How to access the local part of a distributed matrix separately for each Pid

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Ayush Porwal 2019-10-30

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https://ww2.mathworks.cn/matlabcentral/answers/488217-how-to-access-the-local-part-of-a-distributed-matrix-separately-for-each-pid

评论： Walter Roberson 2019-10-30

I want to make a 5 by 5 distributed matrix in such a way that each column in a ith row has a value i. In pMatlab library, I tried implementing the following code.

PARALLEL = 1;
Map = 1;
if PARALLEL
    Map = map([Np 1], {}, 0:Np-1);
end
A = zeros(5,5,Map);
Aloc  = local(A);
for Pid = 0:Np-1
    if Pid == 0
        for i = 1:size(Aloc,1)
            Aloc(i,:) = i;
        end
    end
    if Pid == 1
        j = 4;
        for i = 1:size(Aloc,1)
            Aloc(i,:) = j;
        end
        j = j+1;
    end
end
A = put_local(A,Aloc);
A

However, it seems that the for loop from 0:Np-1 isn't able to access the local part of that Pid. Please help. How can we achive the same thing using PCT?

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回答（1 个）

Walter Roberson 2019-10-30

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https://ww2.mathworks.cn/matlabcentral/answers/488217-how-to-access-the-local-part-of-a-distributed-matrix-separately-for-each-pid#answer_398904

编辑：Walter Roberson 2019-10-30

You overwrite all of Aloc for two different pids, 0 and 1. You can only overwrite all of an array inside parallel workers if it is a local array rather than an output array.

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Ayush Porwal 2019-10-30

Hi Walter

Thanks, I understand the code provided above. Have you worked using pMatlab library by MIT lincoln labs? parfor variable isn't available in that so I am stuck.