NAME

       PSDBTRSV  -  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 PSDBTRSV( 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( * )

           REAL             A( * ), AF( * ), B( * ), WORK( * )

PURPOSE

       PSDBTRSV solves a banded triangular system of linear equations
                                      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 PS@(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 PSDBTRF MUST be called first.