how to use 'OutputFcn' in GA

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imola 2014-8-27

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https://ww2.mathworks.cn/matlabcentral/answers/152486-how-to-use-outputfcn-in-ga

编辑： michio 2023-10-26

Dear All,

I'm trying to use the next function to find some information about previous generation and I found difficulty with writing the state and the options

 options = gaoptimset('OutputFcn', @outputfun); 
      [state,options,optchanged] = outputfun(options,state,flag)

I have this code which is work,

    function [x,fval,exitflag,output,population,score] = optimGA(nvars,lb,PopulationSize_Data,Generations_Data,TolFun_Data,InitialPopulation_Data)
    %%This is an auto generated MATLAB file from Optimization Tool.

could you please explain to me how to write it. or you may have better idea

Thank you in advance

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Answer 1

Alan Weiss 2014-8-27

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https://ww2.mathworks.cn/matlabcentral/answers/152486-how-to-use-outputfcn-in-ga#answer_149979

GA will pass in options, state, and flag. You should pass those exact same options and state to the output function output arguments, and set optchanged to false, unless for some reason you want to change the options during your output function call. See the documentation.

Alan Weiss

MATLAB mathematical toolbox documentation

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imola 2014-8-27

在 MATLAB Online 中打开

Dear Alan,
what do you mean by (You should pass those exact same options and state to the output function output arguments) could you give me example, because I couldn't understand the documentation I wrote  it like this
function[state,options,optchanged] = outputfun(options, state, flag)
flag=false;
options = gaoptimset(state,Population);
options = gaoptimset(options,'Display', 'diagnose');
options = gaoptimset('OutputFcn', @outputfun);
ga(options)

I have this (state,Population) gave error because of population and I don't know if the other lines are correct or no.

thanks for replying

Alan Weiss 2014-8-27

在 MATLAB Online 中打开

 function[state,options,optchanged] = outputfun(options, state, flag)
 optchanged = false;
 % DO NOT set options, state, or flag!
 % Just write code to calculate whatever it is you want here.
 % If you need to read an option, then read it, don't set it.
 % Make sure that your options include @outputfun as your output function.