fmincon objective function input

Hi,

I want to minimize sum of squared variables in fmincon while get the number of variables from users. For example, if he entered i=3, minimize x(1)^2+x(2)^2+x(3)^2. if he entered i=n, minimize x(1)^2+x(2)^2+...x(n)^2. Actually, I don't have any problem to set lower and upper limits and initial condition matrix, but I don't know how to define this function which fmincon accepts.

Thanks

[Matt J]

If you have no nonlinear constraints, though, it would be better to use quadprog

Answer 1

[Matt J]

The objective function can be specified independently of the dimension.

   fun=@(x) norm(x).^2

It is the initial guess that must be chosen based on the problem dimension.