Talk:Gauss–Seidel method

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The article does not mention that the Gauss-Seidel method is only applicable to diagonally dominant, or symmetric positive definite matricies.

For a source, see:

http://mathworld.wolfram.com/Gauss-SeidelMethod.html

[edit] Negative signs

I believe the sentence should read: " where the matrices D, -L, and -U represent the diagonal, strictly lower triangular, and strictly upper triangular parts of A, respectively "

and not:

" negative strictly lower triangular, and negative strictly upper triangular parts of the coefficient matrix "

--Pedroteixeira 01:30, 20 August 2007 (UTC)

[edit] Convergence

Is there an example of a linear system such that the Jacobi method converges but the Gauss-Seidel does not?

Bur40win 03:37, 5 October 2007 (UTC)Michael Harris

[edit] C code is wrong?

I think the C code is wrong. Apparently, someone was trying to be clever and combined two loops into one, by just adding the if( i!=j ) check. HOWEVER, the first loop depends on values of x from the current epoch, whereas the second is supposed to depend on values of x from the previous. As such, this algorithm seems as if it will give the wrong result! Or am I confused?65.183.135.231 (talk) 03:55, 6 May 2008 (UTC)