**Attempt:**

This is my code so far:

Code:

clear all
clc
clf
function x=GaussSeidel(A,b,y,N)
n = length(y);
for k = 1:N
for i=1:n
s=b(i);
for j =1:i-1
s=s-A(i,j)*y(j);
end
for j = i+1:n
s=s-A(i,j)*y(j);
end
x(i)=s/A(i,i);
x(i)=x(k);
end
y = x'
end

However I am getting the following error: Code:

Error: File: Untitled.m Line: 4 Column: 1
Function definitions are not permitted in this context.

Why am I getting this error? What do I need to do?

And my inputs are:

Code:

A=[-5 0 2 0 -1 ;
0 9 0 3 0 ;
2 0 5 0 2 ;
0 -2 0 4 0 ;
-1 0 7 0 7]
b = [8;4;-8;-4;0]
x0=[8;4;-8;-4;0]

For N, how do I know many iterates N are necessary for this problem?

Any help with the code is greatly appreciated.