error in fmincon code

Question

bus14 2019-4-25

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https://ww2.mathworks.cn/matlabcentral/answers/458480-error-in-fmincon-code

评论： bus14 2019-4-25

Hi community,

I am busy optimizing a function in fmincon, I think I have all parameters set up correctly. However I get an error when I am running the code. I think the problem lies in my objective function.

%V=[V(1) V(2) V(3)]=[Y(1) Y(2) Z(1)]
l = 0.4; 
q = 6;
s = [2;2.2];
A1 = [1,1];
x = [20; 25];
d = 80;
V0=[1,2,4]; 
objective = [-s.',(l-q).']; %(l-q).'*y-s.'*z; %[ Y, Z] tried both of these
% X(1)=V(1)+A1(1)*V(3) X(2)=V(2)+A11(2)*V(3)
Aeq = [eye(2), A1.']; %=[1 0 A1(1);0 1 A1(2)]
beq = x;
lb = [0, 0, 0]; %requires 3 bounds as there are 3 variables
ub = [Inf, Inf, d];
sol = fmincon(objective,V0,[],[],Aeq,beq,lb,ub);
y = [sol(1);sol(2)]
z = sol(3)

error that pops up is

Error in probeerfmin (line 14)

sol = fmincon(objective,V0,[],[],Aeq,beq,lb,ub);

Thankyou!

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Answer 1

Torsten 2019-4-25

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编辑：Torsten 2019-4-25

V0 = [1;2;4];
objective = @(V)[-s.',(l-q).']*V;

But why do you shoot with canons on sparrows (means: why do you use a nonlinear optimizer for a linear problem) ?

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bus14 2019-4-25

Thanks Torsten,

Wanted to try if it would also work using fmincon instead of linprog. Might need fmincon later on in making an expectation of this objective function.

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