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error in fmincon code

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bus14 on 25 Apr 2019
Commented: bus14 on 25 Apr 2019
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;
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);

Accepted Answer

Torsten on 25 Apr 2019
Edited: Torsten on 25 Apr 2019
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) ?
  1 Comment
bus14 on 25 Apr 2019
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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