How to apply multiple runs (essentially loop it) on optimization (such as GA and PSO)

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Josiah Jarenee Comia 2021-4-25

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https://ww2.mathworks.cn/matlabcentral/answers/812480-how-to-apply-multiple-runs-essentially-loop-it-on-optimization-such-as-ga-and-pso

评论： Josiah Jarenee Comia 2021-4-25

I want to loop an optimization solution that i've done so that I could generate at least 25 answers (and be it stored in an array) and find the lowest among them. I understand that inside the optimization, it already gives me the optimized answer, but our professor wants us to find the lowest value among certain number of iterations.

I just want to apply loop in this block, then be it stored in an array.

% For Fminsearch
    initguess=[1,2];
    options=optimset('MaxIter',2000,'MaxFunEvals',2000);
    [c,fmin]=fminsearch(OFVL,initguess,options);
% For Genetic Algorithm
    options2=optimoptions('ga','MaxStallGenerations',5000, 'MaxGenerations',5000, 'TolFun', 1e-12);
    [c_ga,fmin_ga]=ga(OFVL,2,[],[],[],[],[],[],[],options2);
%For PSO
    options3 = optimoptions('particleswarm', 'MaxStallIterations',5000, 'MaxIteration', 5000, 'TolFun', 1e-12);
    [c_pso, fmin_pso]=particleswarm(OFVL,2,[],[],options3);

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Answer 1

Walter Roberson 2021-4-25

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https://ww2.mathworks.cn/matlabcentral/answers/812480-how-to-apply-multiple-runs-essentially-loop-it-on-optimization-such-as-ga-and-pso#answer_684045

在 MATLAB Online 中打开

for count = 1 : 3
    % For Fminsearch
        initguess=[1,2]+rand(1,2);
        options=optimset('MaxIter',2000,'MaxFunEvals',2000);
        [c(count,:),fmin(count,:)]=fminsearch(OFVL,initguess,options);
    
    % For Genetic Algorithm
        options2=optimoptions('ga','MaxStallGenerations',5000, 'MaxGenerations',5000, 'TolFun', 1e-12);
        [c_ga(count,:),fmin_ga(count,:)]=ga(OFVL,2,[],[],[],[],[],[],[],options2);
    
    %For PSO
        options3 = optimoptions('particleswarm', 'MaxStallIterations',5000, 'MaxIteration', 5000, 'TolFun', 1e-12);
        [c_pso(count,:), fmin_pso(count,:)]=particleswarm(OFVL,2,[],[],options3);
end