chickadee » atlas-lapack » zgetrf

These routines compute an LU factorization of a general M-by-N matrix A using partial pivoting with row interchanges. Optional argument LDA is the leading dimension of array A. The return values are:

1. a matrix containing the factors L and U from the factorization A = P*L*U;
2. a vector with pivot indices: for 1 <= i <= min(M,N), row i of the matrix was interchanged with row pivot(i)