Why the code gives an error?

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Caped Crusader
Caped Crusader 2013-3-7
Hi I am getting the following error in the code shown below:
function[X] = gauss_seidel(A,b)
N = length(b);
X = zeros(N,1);
err = 1;
while err>0.001
for i =1:1:N
sum = 0;
for j = 1:1:N
if j~=i
sum = sum+A(i,j)*X(j,1);
end
end
X(i,1) = (b(i,1)-sum)/A(i,i);
end
Z = A*X-b;
d = sum(Z);
err = abs(d);
end
and the error is:
>> gauss_seidel(A,b)
??? Subscript indices must either be real positive integers or logicals.
Error in ==> gauss_seidel at 16
d = sum(Z);
I don't know why this error is happening here.

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-3-7
编辑：Azzi Abdelmalek 2013-3-7
You are using sum as a variable, and as a function in
sum = sum+A(i,j)*X(j,1);
d = sum(Z);

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