Not enough input arguments

I am minimizing a function that I created. Getting "Not enough input arguments".

This is the main code:

 y=data;
 y0=0;
 global y y0;

 theta0=[0.5, 0.5];

 [x,fval,exitflag,output,grad,hessian] = fminunc(condlike,theta0)

This is the function file:

 function [ f ] = condlike(x )
 Conditional likelihood evaluation for AR(1)

 global y y0

 [m,n]=size(y);
 g = normpdf(y(1,1),x(1)*y0,x(2));
 for i=1:n-1
    g=g+log(normpdf(y(1,i+1),x(1)*y(1,i),x(2)));
 end

 f=-g;
  end

Answer 1

[Rik]

You forgot to make the first input a function handle, using an @ character. The code below ran without errors for me.

data=rand(10,1);

global y y0;
y=data;
y0=0;
theta0=[0.5, 0.5];
[x,fval,exitflag,output,grad,hessian] = fminunc(@condlike,theta0);

function [ f ] = condlike(x )
%Conditional likelihood evaluation for AR(1)
global y y0
[~,n]=size(y);
g = normpdf(y(1,1),x(1)*y0,x(2));
for i=1:n-1
    g=g+log(normpdf(y(1,i+1),x(1)*y(1,i),x(2)));
end
f=-g;
end

[Joaquin Saldain]

Thank you, newbie mistake I guess.

[Joaquin Saldain]

If I needed to provide an argument to @condlike that is a parameter, so not affected by the minimization, how could I do it?

[Walter Roberson]

http://www.mathworks.com/help/matlab/math/parameterizing-functions.html