Optimization running. Error running optimization. Your fitness function must return a scalar value.

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function c= opt(x)
%x=[20,40,60,80,100,120,140,160];
x=20:20:160
p1 = -0.0001759;
p2 = 0.03395 ;
p3 = 5.987 ;
c = p1.*x.^2 + p2.*x + p3;
disp(c);
plot(x,c);
end
Can anybody help to resolve the error

Answers (2)

Geoff Hayes
Geoff Hayes on 17 Mar 2022
@esiotlab GEC - it looks like your fitness function is returning an array. You must change your code so that a scalar is returned.
It also looks like you are overwriting the input variable x with an array of values. Why? This defeats the purpose of using the algorithm since all results returned by your fitness function will be the same.

Torsten
Torsten on 17 Mar 2022
I can't decipher from function "opt" what you are trying to minimize.
But anyhow: your c has dimension 1x8, but it has to be 1x1.

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