Jacobi Iterations Coding Question

Here's what I have so far with my code. It says that the function file is not available in this context. I am wondering what I have to put where as far as different function files and what not to make it run. Any help is appreciated.

% HW 3 - Problem 2

A=[4 1 -1; 1 -5 -1;  2 -1 -6];
B=[13 -8 -2];
P=[0,0,0];
delta=(1*(10^(-10)));
max1=10;

counter = 0;

function X=jacobi(A,B,P,delta, max1)

for k=1:max1
    for j=1:N
        X(j)=(B(j)-A(j,[1:j-1,j+1:N])*P([1:j-1,j+1:N]))/A(j:j);
        counter = counter + 1;
    end

      err=abs(norm(X'-P));
      relerr=err/(norm(X)+eps);

      p=X';

          if (err<delta)|(relerr<delta)
          break
      end
  end

X=X'

Answer 1

[Walter Roberson]

As the first line of your code, add

function HW2P3

where HW2P3 must match the name of the .m file you have the code stored in.