void DGETRF int *  M,
int *  N,
double *  A,
int *  LDA,
int *  IPIV,
int *  INFO

DGETRF computes an LU factorization of a general M-by-N matrix A using partial pivoting with row interchanges.

The factorization has the form

A = P * L * U

where P is a permutation matrix, L is lower triangular with unit diagonal elements (lower trapezoidal if m > n), and U is upper triangular (upper trapezoidal if m < n).

See http://www.netlib.org/lapack/double/dgetrf.f for more information

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