How can I run this costfunction optimization ?

I am trying to run this optimization:

function [jVal,gradient]=costfunction(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','MaxIter',100)
initialTheta=zeros(1,2)
[optTheta,functionVal,exitFlag]=fminunc(@costfunction,initialTheta,options)

But it says that you need more arguements for theta. How should I define theta for this function while I want matlab to calculate and minimize it?

TNX

[Walter Roberson]

Could you show the exact error message?

Answer 1

[Anisha Mishra]

You have initialised initialTheta = zeros(1,2) which makes an empty 1x2 matrix , i.e , it has 1 row and two columns

where as the theta is a vector with 2 rows and 1 column ,i.e 2x1

So change your initialTheta as:

initialTheta=zeros(2,1);

This will solve your error.

Hope this helps.