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

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

[Tsuwei Tan]

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

Answer 1

[A Jenkins]

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);

[li jian]

I appreciate it very much,thank you. I'm working on the OutputFcns option.But i have difficulty in writing my own custom function to collect every generation's best position and return the collected data. Will you please show me an example. I need it very much now

[li jian]

Hi Jenkins,I have solved the problem with the help of the custom plot function in PlotFcns option

[zainab1996]

can you help with the code plz, i have the same problem