Find values for best and mean fitness value for each generation in Genetic Algorithm

12 vues (au cours des 30 derniers jours)
After running GA, using Optimization toolbox and code below, the following mean and best fitness value graph was obtained.
[x,fval,exitflag,output,population,score] = ...
ga(@revisepartialmodespring,nvars,[],[],[],[],lb,ub,[],[],options);
How to get the value of best fitness at each generation ?.. I wanted to show a comparison of the best fitness v/s generation for different problems on the same graph. Hence I need values to best fitness at each generation.
  1 commentaire
Debaditya Gupta
Debaditya Gupta le 31 Mar 2022
How to get similar type of graph in Particle Swarm Optimization in matlab?
Matlab PSO script is showing only iteration vs best fitnes value, but mean fitness value is not showing

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Alan Weiss
Alan Weiss le 22 Août 2021
Use a Custom Output Function for Genetic Algorithm. Model it on the gaplotbestf plot function. To see that function,
edit gaplotbestf
Alan Weiss
MATLAB mathematical toolbox documentation
  2 commentaires
Ankur Shah
Ankur Shah le 25 Août 2021
Thanks for reply. Could you help me with code. I have tried but am unable to save Generations v/s best fitness data.
Alan Weiss
Alan Weiss le 25 Août 2021
options = optimoptions("ga","OutputFcn",@gascoreoutfun);
rng default % For reproducibility
x = ga(@ps_example,2,[],[],[],[],[],[],[],[],options)
Optimization terminated: average change in the fitness value less than options.FunctionTolerance.
x = 1×2
-4.6793 -0.0860
size(gapopulationhistory)
ans = 1×2
122 2
function [state,options,optchanged] = gascoreoutfun(options,state,flag)
persistent history
optchanged = false;
switch flag
case 'init'
history = [min(state.Score),mean(state.Score)];
assignin('base','gapopulationhistory',history);
case 'iter'
history = [history;min(state.Score),mean(state.Score)];
assignin('base','gapopulationhistory',history);
case 'done'
end
end
Alan Weiss
MATLAB mathematical toolbox documentation

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