MATLAB: Fminunc for upper and lower bound variable definition

MATLABoptimization

Isn't it possible to give upper and lower bound for the variables in the objective function while using fminunc ?

Thank you.

No, fminunc() is for unconstrained optimization. If you want to do constrained optimization, then use fmincon().

Is there any built in function to solve PRSopt_QN with quasi-newton ?

Yes, fminunc is a quasi-newton solver,

Probably the easiest way is to set ‘x0’ appropriately and then bound ‘x(2)’ to be 40:

x0 = [20 40 20];
lb = [0 40 0];
ub = [100 40 100];
fun = @(x) x(1)+x(2)+x(3);
x_min = fmincon(fun,x0,[],[],[],[],lb,ub)