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

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

       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.

LAPACK version 1.5                                 12 May 1997                                       PSDBTRSV(l)

       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( * )