fmincon works but GA won't work

Question

RAHUL KUMAR 2019-9-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/478871-fmincon-works-but-ga-won-t-work

评论： Walter Roberson 2019-9-4

when i use fmincon it gives some optimized result but when i use GA it shows some like ''constraint not satisfied''.In both case i use same constraint and bounds.

why GA won't work on my same program

%xo=[0.2,0.015,100]
nvars=3;
A=[];
b=[]; 
Aeq=[];
beq=[];
lb=[0.1,0.012,10];    %lower bound
ub=[0.6,0.080,150];    %upper bound
nonlincon = @(x)constriant_press(x);    % calling constraint function
Fitnessfun =@(x)objective_function(x);  %calling objective function
options = optimoptions(@fmincon,'Display','iter-detailed','Algorithm','sqp','MaxFunctionEvaluations',5000,'TolFun',1e-5)
%options = optimset('Display','iter','TolFun',1e-6)
%options = optimset('PlotFcns',{@optimplotfval,@optimplotx});
%options = optimset('PlotFcns',{@optimplot
%[X,fval]=fmincon(Fitnessfun,xo,[],[],[],[],lb,ub,nonlincon,options)
[X,fval] = ga(Fitnessfun,nvars,[],[],[],[],lb,ub,nonlincon,options)

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Walter Roberson 2019-9-4

I cannot seem to see where you have posted the code for your objective or constraint function?

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Answer 1

Alan Weiss 2019-9-4

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/478871-fmincon-works-but-ga-won-t-work#answer_390393

In general, ga is not as reliable a solver as fmincon. So if you have smooth objective and constraints, you should use fmincon. See Table for Choosing a Solver.

Alan Weiss

MATLAB mathematical toolbox documentation