gamultiobj's options

Question

Tony Cheng 2017-1-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/320832-gamultiobj-s-options

评论： Tony Cheng 2017-2-14

采纳的回答： Alan Weiss

Hi guys,

I am using a PC with 2014b and run the MOGA files. Now two questions appear:

The first is:

The option set for gamultiobj is

options_moga = gaoptimset(@gamultiobj) .

If the parameters in gamultiobj are set according to its syntax without options_moga , i.e., like this:

gamultiobj( AIM1 , 9   , ...
                 A_inequation , power_constraint , ...
                 AEQ_modify   , BEQ_modify  , ...
                 lower_bound  , upper_bound , ...
                 nonliear_constraint );

the PC run the file for round 100 seconds and the results seem right, because they are quite similar to the those from fmincon.

But , if the parameters in gamultiobj are set according to its syntax with options_moga , i.e., like this:

gamultiobj( AIM1 , 9   , ...
                 A_inequation , power_constraint , ...
                 AEQ_modify   , BEQ_modify  , ...
                 lower_bound  , upper_bound , ...
                 nonliear_constraint , options_moga ) ;

the PC run the file for round 20 seconds only and the results are not right, because they are quite far from those by fmincon.

Could u pls tell me why it behaves like this?

The second is:

the 9 unknowns set by gamultiobj is a 1*9 rank vector, but if they are used in fmincon, they are a 9*1 column vector. Is it right?

Thanks so much for these two questions!

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Answer 1

Alan Weiss 2017-1-18

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https://ww2.mathworks.cn/matlabcentral/answers/320832-gamultiobj-s-options#answer_251020

I do not understand at all what you are asking in your first question, sorry.

For the second question, ga and gamultiobj require population members to be row vectors. In contrast, fmincon does not care whether the x0 argument is a row vector, column vector, or array, as explained here.

Alan Weiss

MATLAB mathematical toolbox documentation

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Tony Cheng 2017-2-13

All right!

Thank you very much, Walter!

Tony Cheng 2017-2-14

Hi Walter,

Could you tell me the time consumed in testing the settings with and without optimoptions(@gamultiobj)?

If optimoptions(@gamultiobj) is explicitly given in gamultiobj like this gamultiobj( AIM1 , 9 , ... A_inequation , power_constraint , ... AEQ_modify , BEQ_modify , ... lower_bound , upper_bound , ... nonliear_constraint , gaoptimset(@gamultiobj) ) ;

then it uses for about 15 seconds.

If gamultiobj( AIM1 , 9 , ... A_inequation , power_constraint , ... AEQ_modify , BEQ_modify , ... lower_bound , upper_bound , ... nonliear_constraint );

then it cost about 110 seconds to finish the codes.

The results from these two settings are quite different. The former setting produces smaller values which looks like wrong, while the latter produces larger ones which looks like right.

I am using 2014b.

Thanks man!

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