NAME

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

SYNOPSIS

       SUBROUTINE PSPTTRSV( UPLO, N, NRHS, D, E, JA, DESCA, B, IB, DESCB, AF, LAF,  WORK,  LWORK,
                            INFO )

           CHARACTER        UPLO

           INTEGER          IB, INFO, JA, LAF, LWORK, N, NRHS

           INTEGER          DESCA( * ), DESCB( * )

           REAL             AF( * ), B( * ), D( * ), E( * ), WORK( * )

PURPOSE

       PSPTTRSV solves a tridiagonal 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 tridiagonal
       triangular matrix factor produced by the
       Cholesky factorization code PSPTTRF
       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 PSPTTRF MUST be called first.