Options for Genetic Algorithm don't work

2017 4 14
1 个回答
更新时间：2019 2 25
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Hello. I need to set limited computation time for my GA optimization. I used both gaoptimset and optimset, but they don't work. It's not terminated when time is up. Also tried optimoptions, but got an error:
Invalid solver specified. Provide a solver name or handle (such as 'fmincon' or @fminunc). Type DOC OPTIMOPTIONS for a list of solvers.
My code:
options = gaoptimset('TimeLimit',30);
%options = optimset('MaxTime',30);
%options = optimoptions('MaxTime',30);
[x,fval] = ga(fitnessfcn,nvars,A,b,[],[],LB,UB,nonlcon,options)
What's wrong? (MATLAB R2014b)

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jianli chen
jianli chen 2019-2-25
Hi Vladimir,I encounter the same problem when using GA optimization in Matlab. Has you solved this problem? Thanks for your help.
Walter Roberson
Walter Roberson 2019-2-25
jianli chen: which MATLAB release are you using, and how do you create the options?

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回答（1 个）

Alan Weiss
Alan Weiss 2017-4-14

1 个投票

For R2014b use gaoptimset. For R2014b, use the correct option names, as many option names changed in R2016a. In particular, for R2014b, the maximum time is specified by the MaxTime option, not the TimeLimit option.
Alan Weiss
MATLAB mathematical toolbox documentation

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Vladimir Berezkin
Vladimir Berezkin 2017-4-14
MaxTime option doesn't work for gaoptimset, it returns en error: Unrecognized parameter name 'MaxTime'. With TimeLimit it's no error, but the program is not terminated.
Alan Weiss
Alan Weiss 2017-4-19
Sorry, I got it exactly backwards. TimeLimit is indeed the legacy name, the appropriate one for you to use.
You do not show that you are using parallel computing in your options. There was a bug that caused TimeLimit not to be honored in parallel in the way that you would expect. This was fixed in R2015b. So, if you are using parallel computing, then adjust your call as suggested in one of the links.
Alan Weiss
MATLAB mathematical toolbox documentation
Vladimir Berezkin
Vladimir Berezkin 2017-4-21
编辑：Vladimir Berezkin 2017-4-22
Thank you for your reply. I installed R2016b, but it still doesn't work. Actually, I tried another termination criteria such as maximum number of generations, and it also doesn't help. A feature of my code is that I use external simulation program connected to MATLAB via COM interface. So, my fitness function just receives a set of input variables, sends it to the simulation program and gets the result. All calculations are carried out in the external software, not in MATLAB. I suppose this is the reason of my problem. But is it possible to do smth about that?
Alan Weiss
Alan Weiss 2017-4-24
Sorry, I have never heard of this problem before. Perhaps you should contact technical support.
Alan Weiss
MATLAB mathematical toolbox documentation

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