dgetrf man page on IRIX

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DGETRF(3F)							    DGETRF(3F)

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

SYNOPSIS
     SUBROUTINE DGETRF( M, N, A, LDA, IPIV, INFO )

	 INTEGER	INFO, LDA, M, N

	 INTEGER	IPIV( * )

	 DOUBLE		PRECISION A( LDA, * )

PURPOSE
     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).

     This is the right-looking Level 3 BLAS version of the algorithm.

ARGUMENTS
     M	     (input) INTEGER
	     The number of rows of the matrix A.  M >= 0.

     N	     (input) INTEGER
	     The number of columns of the matrix A.  N >= 0.

     A	     (input/output) DOUBLE PRECISION array, dimension (LDA,N)
	     On entry, the M-by-N matrix to be factored.  On exit, the factors
	     L and U from the factorization A = P*L*U; the unit diagonal
	     elements of L are not stored.

     LDA     (input) INTEGER
	     The leading dimension of the array A.  LDA >= max(1,M).

     IPIV    (output) INTEGER array, dimension (min(M,N))
	     The pivot indices; for 1 <= i <= min(M,N), row i of the matrix
	     was interchanged with row IPIV(i).

     INFO    (output) INTEGER
	     = 0:  successful exit
	     < 0:  if INFO = -i, the i-th argument had an illegal value
	     > 0:  if INFO = i, U(i,i) is exactly zero. The factorization has
	     been completed, but the factor U is exactly singular, and
	     division by zero will occur if it is used to solve a system of
	     equations.

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