# I try to write simple analytical function Gomez and Levy with ga in optimization toolbox but it cannot run

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sogol bandekian el 7 de Mayo de 2022
Comentada: Walter Roberson el 24 de Mayo de 2022
%fitness function Gomez and Levy
function y=fitnessfunctiongl(x)
x1=x(1);
x2=x(2);
y=(4*x1.^2)-2.1*x1.^4+1/3*x1.^6+(x1*x2)-4*x2.^2+4*x2.^4;
end
¬¬¬¬¬%constraints
function [c ,ceq]=constraintgl(x)
x1=x(1);
x2=x(2);
c=-sin(4*pi*x1)+2*sin(2*pi*x2)^2-1.5;
ceq=[];
end
%main script to pass function and constraints to ga for optimization
ObjFcn=@fitnessfunctiongl;
nvars=2;
lb=[-1, -1];
ub=[0.75, 1];
nonlcon=@constraintgl;
options = optimoptions('ga','ConstraintTolerance',1e-6,'Display','iter','PlotFcn',{@gaplotrange,@gaplotbestf,@gaplotselection,@gaplotmaxconstr}); %plotting the process of finding the solution
%solution and function value
[x , fval,exitFlag,output,population,scores]= ga(ObjFcn,nvars,[],[],[],[],lb,ub,nonlcon,options);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%errors
[state,optimvalues] = callOnePlotFcn(fname,plotNames{i},state,options.OutputPlotFcnOptions,optimvalues,'init',args{i}{:});
Error in gacon (line 55)
Error in ga (line 406)
[x,fval,exitFlag,output,population,scores] = gacon(FitnessFcn,nvars, ...
Error in maingl (line 11)
[x , fval,exitFlag,output,population,scores]= ga(ObjFcn,nvars,[],[],[],[],lb,ub,nonlcon,options);
##### 2 comentariosMostrar NingunoOcultar Ninguno
Walter Roberson el 7 de Mayo de 2022
What error did you encounter?
sogol bandekian el 10 de Mayo de 2022
Error using makeState (line 61)
Your fitness function must return a scalar value.
Error in gacon (line 44)
state = makeState(GenomeLength,SubFitness,Iterate,subtype,options);
Error in ga (line 406)
[x,fval,exitFlag,output,population,scores] = gacon(FitnessFcn,nvars, ...
Error in maingl (line 11)
[x , fval,exitFlag,output,population,scores]= ga(ObjFcn,nvars,[],[],[],[],lb,ub,nonlcon,options);

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Walter Roberson el 10 de Mayo de 2022
y=(4*x1.^2)-2.1*x1.^4+1/3*x1.^6+(x1*x2)-4*x.^2+4*x2.^4;
Notice that you have 4*x.^2 . But x is a vector so that would return a vector.
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sogol bandekian el 22 de Mayo de 2022
I did this in MATLAB online but the plot are empty.how I can fix this?
Walter Roberson el 24 de Mayo de 2022
The plots are not empty. The optimization is configured for a maximum number of generations and that is the x axis used so that it does not get continually redrawn as more generations are processed. The optimization either succeeded or failed in a small number of generations, on the order of 5 generations.

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### Más respuestas (1)

Bhavana Ravirala el 10 de Mayo de 2022
Hi Sogol,
When I try to reproduce the issue at my end I encountered the error as Function definition not supported in this context. Create functions in a code file. If you are facing the same error refer to the below link to eliminate the error.
If not, can you send us the exact error message that you are getting.
Hope this helps!!
##### 1 comentarioMostrar -1 comentarios más antiguosOcultar -1 comentarios más antiguos
sogol bandekian el 10 de Mayo de 2022
hello thank you for reply.these below errors are what I got
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Error using makeState (line 61)
Your fitness function must return a scalar value.
Error in gacon (line 44)
state = makeState(GenomeLength,SubFitness,Iterate,subtype,options);
Error in ga (line 406)
[x,fval,exitFlag,output,population,scores] = gacon(FitnessFcn,nvars, ...
Error in maingl (line 11)
[x , fval,exitFlag,output,population,scores]= ga(ObjFcn,nvars,[],[],[],[],lb,ub,nonlcon,options);

Iniciar sesión para comentar.

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