pcdbtrf(3) debian man page | unix.com

PCDBTRF(l)						   LAPACK routine (version 1.5) 						PCDBTRF(l)

NAME
       PCDBTRF - compute a LU factorization of an N-by-N complex banded diagonally dominant-like distributed matrix with bandwidth BWL, BWU

SYNOPSIS
       SUBROUTINE PCDBTRF( N, BWL, BWU, A, JA, DESCA, AF, LAF, WORK, LWORK, INFO )

	   INTEGER	   BWL, BWU, INFO, JA, LAF, LWORK, N

	   INTEGER	   DESCA( * )

	   COMPLEX	   A( * ), AF( * ), WORK( * )

PURPOSE
       PCDBTRF computes a LU factorization of an N-by-N complex banded diagonally dominant-like distributed matrix with bandwidth BWL, BWU: A(1:N,
       JA:JA+N-1).  Reordering is used to increase parallelism in the factorization.  This reordering results in factors that are  DIFFERENT  from
       those produced by equivalent sequential codes. These factors cannot be used directly by users; however, they can be used in
       subsequent calls to PCDBTRS to solve linear systems.

       The factorization has the form

	       P A(1:N, JA:JA+N-1) P^T = L U

       where U is a banded upper triangular matrix and L is banded lower triangular, and P is a permutation matrix.

LAPACK version 1.5						    12 May 1997 							PCDBTRF(l)