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

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esiotlab GEC 2022-3-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1673919-optimization-running-error-running-optimization-your-fitness-function-must-return-a-scalar-value

评论： Geoff Hayes 2022-3-23

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

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Answer 1

Geoff Hayes 2022-3-17

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https://ww2.mathworks.cn/matlabcentral/answers/1673919-optimization-running-error-running-optimization-your-fitness-function-must-return-a-scalar-value#answer_920169

@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.