trying to use the fmincon function

Hello,

I am trying to use the fmincon with a external function definition.

I ran the example at https://www.mathworks.com/help/optim/ug/fmincon.html and it wroked as described

I tried to define the function as an external function as shown below.

% script calling fmincon start

clc

clear all

x0=[-1,2];

A=[1,2];

b=1;

zeta=fmincon(fun,x0,A,b);

% script calling fmincon end

% script defining fun start

function q=fun(x)

q=100*(x(2)-x(1)^2)^2+(1-x(1))^2;

end

% script defining fun end

I get this error: Not renough input arguments from the fun script

Not sure how to fix this probem

Thank you

Answer 1

[Torsten]

Works for me after changing "fun" in "@fun":

   % script calling fmincon start
        clc
        clear all
        x0=[-1,2];
        A=[1,2];
        b=1;
        zeta=fmincon(@fun,x0,A,b)

Local minimum found that satisfies the constraints.

Optimization completed because the objective function is non-decreasing in 
feasible directions, to within the value of the optimality tolerance,
and constraints are satisfied to within the value of the constraint tolerance.

zeta = 1×2

0.5022 0.2489

    % script calling fmincon end
    % script defining fun start
    function q=fun(x)
    q=100*(x(2)-x(1)^2)^2+(1-x(1))^2;
    end
    % script defining fun end

[Robert Jones]

Great, Thank you