how can i save every generation's best position using ga

Question

li jian 2014-3-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/123459-how-can-i-save-every-generation-s-best-position-using-ga

评论： Tsuwei Tan 2021-4-20

在 MATLAB Online 中打开

i'm using the ga function in matlab, i want to save every generation's best position

how can i do that.becanse i cannot find

[x,fval,exitflag,output,population,scores] = ga(fitnessfcn,nvars,...)

return such values

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Tsuwei Tan 2021-4-20

在 MATLAB Online 中打开

options = optimoptions('ga',..'OutputFcns',@ga_save_each_gen);

I did a simple funciton ga_save_each_gen to do so.

function [state,options,optchanged]=ga_save_each_gen(options,state,flag)
        Score_gen=state.Score;
        Population_gen=state.Population;
        Generation_gen=state.Generation;
        optchanged=[];
        save(['gen_' num2str(Generation_gen,'%.4d') '.mat'],'Score_gen','Population_gen','Generation_gen')
end

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Answer 1

A Jenkins 2014-3-28

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/123459-how-can-i-save-every-generation-s-best-position-using-ga#answer_131012

在 MATLAB Online 中打开

Use gaoptimset to change the options. Display and PlotFcns will show some detail. You may also want to look at the OutputFcns option where you can write your own custom function to collect data.

A = [1 1; -1 2; 2 1];
b = [2; 2; 3];
lb = zeros(2,1);
ga_options=gaoptimset('Display','iter','PlotFcns',@gaplotbestf);
[x,fval,exitflag,output,population,scores] = ga(@lincontest6,... 
    2,A,b,[],[],lb,[],[],ga_options);