MATLAB: Not enough input arguments error/making a function using @ error.

Question

Hi, I'm trying to do an optimization in matlab for the first time. However, I still don't get how to declare the function using @. I'm trying to do a barrier function method. I've made a function files ObjFun.m and Constr.m and now I'm declaring the barrier function as:

X = [6 6];
penalty_r = 0.5;
f = @ (x) ObjFun - penalty_r .* log(Constr);

and trying to solve:

sol = fminunc(f,X)

and after that proceeds with the rest of the algorithm.

My question is, I always have problems with the declaring function f that consists of other functions like ObjFun and Constr. Such as: not enough input arguments.

How should I declare this?

Please help.

I'm using Matlab R2015b

Answer 1

You didn’t post ‘ObjFun’, but assuming it is also a function of ‘x’, you need to call it as a function in your anonymous function:

f = @ (x) ObjFun(x) - penalty_r .* log(Constr);

I assume ‘Constr’ is a constant scalar that you’ve already defined in your workspace.