DragonFly On-Line Manual Pages

PDDBTRSV(l)                            )                           PDDBTRSV(l)

NAME
       PDDBTRSV - solve a banded triangular system of linear equations  A(1:N,
       JA:JA+N-1) * X = B(IB:IB+N-1, 1:NRHS)

SYNOPSIS
       SUBROUTINE PDDBTRSV( UPLO, TRANS, N, BWL, BWU, NRHS, A, JA, DESCA, B,
                            IB, DESCB, AF, LAF, WORK, LWORK, INFO )
           CHARACTER TRANS, UPLO
           INTEGER BWL, BWU, IB, INFO, JA, LAF, LWORK, N, NRHS
           INTEGER DESCA( * ), DESCB( * )
           DOUBLE PRECISION A( * ), AF( * ), B( * ), WORK( * )

PURPOSE
       PDDBTRSV solves a banded triangular system of linear equations A(1:N,
       JA:JA+N-1) * X = B(IB:IB+N-1, 1:NRHS)                                or
                           A(1:N, JA:JA+N-1)^T * X = B(IB:IB+N-1, 1:NRHS)

       where A(1:N, JA:JA+N-1) is a banded
       triangular matrix factor produced by the
       Gaussian elimination code PD@(dom_pre)BTRF
       and is stored in A(1:N,JA:JA+N-1) and AF.
       The matrix stored in A(1:N, JA:JA+N-1) is either
       upper or lower triangular according to UPLO,
       and the choice of solving A(1:N, JA:JA+N-1) or A(1:N, JA:JA+N-1)^T is
       dictated by the user by the parameter TRANS.

       Routine PDDBTRF MUST be called first.

ScaLAPACK version 1.7           13 August 2001                     PDDBTRSV(l)