How to save GA optimization iteration data in to a file?

I use Genetic Algorithm (GA)part of the optimization toolbox for my work. The optimized values after each iteration will be displayed on the command window and a graph of the same will be updated. But i couldn't find any option to save those displayed values to a file to generate the same graph in future. I also need those values to for post processing. help me in this regard.

Is there any option to save the generated graph automatically once the optimization is over?

[Daniel Frisch]

https://de.mathworks.com/matlabcentral/fileexchange/80831-outputfcn_global

Answer 1

[Matt J]

An Output Function is probably what you need

http://www.mathworks.com/help/gads/genetic-algorithm-options.html#f17837

[joshua Abam]

Hi

I am having difficulties implimenting your response can you please help by using this example to illustrate to me how to use the output function to save every iteration of a GA to a file so I can have assese to it in the future.

function f = gaintobj(x)

f = rastriginsfcn([x(1)-6 x(2)-13]);

f = f + rastriginsfcn([x(3)-3*pi x(4)-5*pi]);

lb = [1 1 -30 -30];

ub = [20 20 70 70];

%%

% Set the integer variables and number of variables.

IntCon = [1 2];

nvar = 4;

%%

% Set options to call the custom output function, and to initially have

% little crossover.

options = optimoptions('ga','OutputFcn',@gaoutputfunround,'CrossoverFraction',0.2);

%%

% For reproducibility, set the random number generator.

rng(10)

%%

% Set the objective function and call the solver.

fun = @gaintobj;

[x,fval] = ga(fun,nvar,[],[],[],[],lb,ub,[],IntCon,options)