error in particle swarm optimization code

Question

scorpio 09 2014-4-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/124442-error-in-particle-swarm-optimization-code

回答： Walter Roberson 2014-4-4

i got this code from mathworks

clear all;
numofdims = 30;
numofparticles = 50;
c1 = 2;
c2 = 2;
numofiterations = 1000;
V = zeros(50, 30);
initialpop = V;
Vmin = zeros(30, 1);
Vmax = Vmin;
Xmax = ones(30, 1) * 100;
Xmin = -Xmax;
pbestfits = zeros(50, 1);
worsts = zeros(50, 1);
bests = zeros(50, 1);
meanfits = zeros(50, 1);
pbests = zeros(50, 30);
initialpop = Xmin + (Xmax - Xmin) .* rand(numofparticles, numofdims);
X = initialpop;
fitnesses = testfunc1(X);
[minfit, minfitidx] = min(fitnesses);
gbestfit = minfit;
gbest = X(minfitidx, :);
for i = 1:numofdims
        Vmax(i) = 0.2 * (Xmax(i) - Xmin(i));
        Vmin(i) = -Vmax(i);
    end
for t = 1:1000
        w = 0.9 - 0.7 * (t / numofiterations);
        for i = 1:numofparticles
            if(fitnesses(i) < pbestfits(i))
                pbestfits(i) = fitnesses(i);
                pbests(i, :) =  X(i, :);
            end
        end
        for i = 1:numofparticles
            for j = 1:numofdims
                V(i, j) = min(max((w * V(i, j) + rand * c1 * (pbests(i, j) - X(i, j))...
                    + rand * c2 * (gbest(j) - X(i, j))), Vmin(j)), Vmax(j));
                X(i, j) = min(max((X(i, j) + V(i, j)), Xmin(j)), Xmax(j));
            end
        end
        fitnesses = testfunc1(X);
        [minfit, minfitidx] = min(fitnesses);
        if(minfit < gbestfit)
            gbestfit = minfit;
            gbest = X(minfitidx, :);
        end
        worsts(t) = max(fitnesses);
        bests(t) = gbestfit;
        meanfits(t) = mean(fitnesses);
end

when is execute

i am getting error in line "initialpop = Xmin + (Xmax - Xmin) .* rand(numofparticles, numofdims);"

Error using *
Inner matrix dimensions must agree.

please help me

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Answer 1

Walter Roberson 2014-4-4

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/124442-error-in-particle-swarm-optimization-code#answer_132040

That code was taken from a user posting asking for help. The code is not functional.

The user appears to have copied from a 2012 post in stackoverflow, as the same code and same error appeared then.

When you run into trouble with code that you copied, you should be asking the author of the code. Or writing your own code. If you had written the code then we could at least have asked you what the intent of the line was.