"Error not enough input arguments "

This is my code and I am getting error" not enough input parameters" in line 4 .Can anyone please rectify the problem ?

function[jval, gradient]= costfuntion(theta)
jval= (theta(1)-5)^2 + ...
      (theta(2)-5)^2;
gradient= zeros(2,1);
gradient(1)= 2*(theta(1)-5);
gradient(2)= 2*(theta(2)-5);
options = optimset('GradObj','on', 'MaxIte', 100);
initialTheta= zeros(2,1);
[optTheta,funcval, exitFlag]= fminunc(@costfunction, initialTheta, options);

[Aditya Verma]

Hi! May I know how you're trying to call this function? According to my understanding, you're trying to operate on a matrix with two elements. A possible call to this function could be:

costfuntion([10 20])

[Walter Roberson]

The lines start from options need to be either before the function or else in a different file.

Answer 1

[KSSV]

I think you are running your code by using either run button or F5 button. This is a function, you cannot run like that. You need to save it in a directory on the name costfunction.m. And call it in command window.

theta = rand(1,2) ;  % some random values for demo
[jval, gradient]= costfunction(theta) ;

I have checked the code, it is running fine.

[ananya mittal]

I am trying this on MATLAB 2017a. It is running an infinite loop of error. And shows the error

"THROWFMINUNCGRADOBJANDLARGESCALEWARNING throws a warning for the

% following case. For R2017a and R2017b only, we are still supporting

% "optimset" users who specify the trust-region algorithm in fminunc via

% the GradObj and LargeScale options for fminunc. From 18a onwards,

% LargeScale will be ignored for fminunc and users will have to use

% Algorithm."