How do you get fval with iterations out of ga and particleswarm (genetic algorithms and particle swarm)

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JMP Phillips
JMP Phillips 2015-9-1
评论： Mark Brandon 2019-9-14
Currently I have:
[s_best,fval_best] = ga(fhandleformatlab,d_fun,[],[],[],[],lb_fun, ub_fun,[],[],options);
[s_best,fval_best,~,~] = particleswarm(fhandleformatlab,d_fun,lb_fun, ub_fun,options);
But I want to save the result of fval at each iteration/generation to an array, so I can analyse how fast the algorithm converges to optimum. I cannot see how to get this output into an array in the matlab workspace.
Note - I do not merely want to display the output, which I can do. I cannot figure out how to output it to an array in the workspace so I can plot it, analyse it etc.

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Walter Roberson
Walter Roberson 2015-9-1
Use an output function; see http://www.mathworks.com/help/gads/genetic-algorithm-options.html
You would initialize an array and you would have the output function append to the array each time it was called. I recommend using nested functions for this purpose so that you avoid the temptation of global variables.

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