Fmincon solution is same as initial guess

Question

Samy Alkhayat 2021-7-14

0
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https://ww2.mathworks.cn/matlabcentral/answers/878568-fmincon-solution-is-same-as-initial-guess

评论： Sulaymon Eshkabilov 2021-7-15

Hello,

My Fmincon function does not minimize the cost function, instead, it reports the same initial guess provided to it. Please help with recommendations to the piece of code below:

function J=cost_function(y)
for i=1:size(a,1)
    AA = y0*b(i,:)';
    BB = y0*c(i,:)';
    CC = (y0(1).*c(i,1)/BB)*c(i,1) + (y0(2).*c(i,2)/BB)*c(i,2);
    DD = y0*d(i,:)';
    EE = y0*e(i,:)';
    all(i,:)=[AA, BB, CC, DD, EE];
end
     
    J=sum(abs(all(1,:) - x(1:5)') ./ x(1:5)')^2;
    

The script calculates the a, b, c, d, e,....... and passes them to the function along with "y0".

Please advise, and thanks in advance

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Answer 1

Sulaymon Eshkabilov 2021-7-14

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https://ww2.mathworks.cn/matlabcentral/answers/878568-fmincon-solution-is-same-as-initial-guess#answer_746868

编辑：Sulaymon Eshkabilov 2021-7-14

在 MATLAB Online 中打开

THere are a couple of errs oin your fcn, i.e. y0, a,b,c,d not defined. Moreover, x is not defined.

function J=cost_function(y0, a, b, c, d, e, x)  
for i=1:size(a,1)
    AA = y0*b(i,:)';
    BB = y0*c(i,:)';
    CC = (y0(1).*c(i,1)/BB)*c(i,1) + (y0(2).*c(i,2)/BB)*c(i,2); % Check: multiplied and divided by c(i,1) and c(i,2)
    DD = y0*d(i,:)';
    EE = y0*e(i,:)';
    all(i,:)=[AA, BB, CC, DD, EE];
end
     
    J=sum(abs(all(1,:) - x(1:5)') ./ x(1:5)')^2;
    