Parallel for loop in loading files

Question

Sultan 2019-10-19

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/486314-parallel-for-loop-in-loading-files

回答： Rik 2019-10-19

I would like to make the following code in parallel. Could you please help me?

clear all; clc;
for kk= 1:30014
    m = 0; n = 0;
    for j = 1:5
        load(['File' num2str(kk) '_'  num2str(j) '.mat']);
        iteration(j) = iter;
        FScore(j) = score;
        NDistance(j)= distance;
        allF(j,:) = F;
        if FScore(j) < 0
            m = m+1;
            negF(m,:) = F;
            negFScore(m) = score;
            negDistance(m) = distance;
        else
            n =n+1;
            posF(n,:) = F;
            posFScore(n) = score;
            posDistance(n) = distance;
        end
    end
    [minFScore,minFScoreIndex]  = min(FScore);
    [minDistance, minDistanceIndex] = min(NDistance);
    if minFScore < 0
        [minNegFScore,minNegFScoreIndex]  = min(negFScore);
        [minNegDistance, minNegDistanceIndex] = min(negDistance);
        allFVoilatingH = negH(minNegFScoreIndex,:);
        allFVoilatingAndMinDistH = negH(minNegDistanceIndex,:);
        filename = ['nv_' num2str(kk) '.mat'];
        save(filename,'negDistance','allFVoilatingH', 'allFVoilatingAndMinDistH', 'minDistance','minNegFScore','minNegFScoreIndex','minNegDistance','minNegDistanceIndex','minDistanceIndex','allF','normDistance','negFScore','negH', 'minFScore','minFScoreIndex', 'FScore', 'iteration');
    else
        filename = ['pv_' num2str(kk) '.mat'];
        save(filename, 'allF','NDistance','minFScore','minFScoreIndex', 'FScore', 'iteration');
    end
    clear all; clc;
end

Thanks in advance.

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Answer 1

Rik 2019-10-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/486314-parallel-for-loop-in-loading-files#answer_397217

Removing clear all from your code and loading to a struct (instead of poofing variables into existence) should allow you to replace the outer for loop by a parfor. Don't forget to preallocate your variables in the loop, instead of implicitly setting them to empty arrays with clear.