Genetic Algorithm: Failure in initial user-supplied fitness function evaluation. GA cannot continue.

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Nicolas
Nicolas 2017-11-10
评论： VIGNESH KUMAR R C 2023-5-5
Hello everyone !
I'm currently trying to use a genetic algorithm for a simple problem, but it fails and I don't know why. This is my first time using a genetic algorithm function.
I have a function AlgoGen with 3 variables:
[Sol] = AlgoGen(alpha,beta,gamma).
That I can calculate if I try several inputs, so this function works. But when I'm trying to use:
SOL = ga(@(x) AlgoGen(x),3,[],[],[],[],[1 2.25*10^-2 1],[5 15*10^-2 5])
This is the error message I get:
Not enough input arguments.
Error in AlgoGen (line 5)
length=[1 0.75 1 1 alpha gamma]*10^-2;
Error in @(x)AlgoGen(x)
Error in createAnonymousFcn>@(x)fcn(x,FcnArgs{:}) (line 11)
fcn_handle = @(x) fcn(x,FcnArgs{:});
Error in makeState (line 47)
firstMemberScore = FitnessFcn(state.Population(initScoreProvided+1,:));
Error in galincon (line 17)
state = makeState(GenomeLength,FitnessFcn,Iterate,output.problemtype,options);
Error in ga (line 374)
[x,fval,exitFlag,output,population,scores] = galincon(FitnessFcn,nvars, ...
Caused by:
Failure in initial user-supplied fitness function evaluation. GA cannot continue.
Anyone can help me ? Thank you.
  1 个评论
VIGNESH KUMAR R C
VIGNESH KUMAR R C 2023-5-5
This is my Cost Function definition:
function f = costFn(i_d, i_q)
L_d = 100e-6;
L_q = 500e-6;
lambda_f = 0.01;
P = 6;
T_e = 2.5;
f = (T_e - (3/2)*(P/2)*(lambda_f.*i_q + (L_d-L_q).*i_d.*i_q)).^2;
end
This is how I am trying to implement ga:
clc;
clear;
type costFn
fun = @(i_d, i_q)(costFn(i_d, i_q));
fsurf(fun, [-50 50 -50 50])
colormap 'parula'
xlabel('i_d')
ylabel('i_q')
sol = ga(fun,2);
I am getting same error as above. Kindly help me out.

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采纳的回答

Star Strider
Star Strider 2017-11-10
You need to supply a function with a single vector argument to ga.
This should work:
SOL = ga(@(x) AlgoGen(x(1),x(2),x(3)),3,[],[],[],[],[1 2.25*10^-2 1],[5 15*10^-2 5])
Here, ‘x(1)=alpha’, ‘x(2)=beta’ and ‘x(3)=gamma’.
No other changes to your code should be necessary.

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