MATLAB: Genetic Algorithm – Plotting fitness values

Question

Hello,

I'm running a genetic algorithm in Matlab with [x,fval]=ga(gaproblem)

This all works fine and I get nice results. Now I wish to plot the best fitness function value at each generation; according to the user manual it should be as simple as setting

gaproblem.PlotFcns=@gaplotbestf;

This however produces no result, I get no figure. As far as I understand @gaplotbestf is built in, and there should be no need to define it, or am I getting it wrong?

It would be nice if someone could help.

Answer 1

PlotFcns needs to be passed in as an option for ga:

problem.options.PlotFcns = @gaplotbestf;