TOBIT function error message

Hi!

I'm quite new to MATLAB and I get strange error message I can't understand: "Error using MLobjective_1 (line 3) Not enough input arguments." My Code:

clc;
clear;
format('long');
load 'matlabdata'

X=[Y AGE MARRIED WOMAN KIDS ones(length(I),1)];

theta_ini=[0.1 0.1 0.1 1]'; 

options = optimset('display','iter','maxiter',10000,'maxfunevals',20000,'TolX',1e-12,'TolFun',1e-12);

tic
[theta,fval1,exitflag1,output1]=fminsearch(@(theta) MLobjective_1(theta,I,X),theta_ini,options)
toc

The function:

function f = MLobjective (theta,I,X)

beta=theta(1:4,1);
sigma=theta(5,1);
n=length(I); 

for i=1:n; 
   if  I(i,1)==0
      lik_contribution(i,1)=(1-normcdf(X(i,:)*beta/sigma));
   else
      lik_contribution(i,1)=(1/sigma*normpdf(I(i)-X(i)*beta)/sigma);
   end;
end

Can someone recognize where is the problem??

Thank you!

[Geoff Hayes]

Nitay - the error message is telling you that when MLobjective_1 is being called, not enough input arguments are being provided to it. According to the function signature, three inputs are expected (actually the signature is for a function named MLobjective - is this a typo or has a different function been provided?).