NAME

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

SYNOPSIS

       SUBROUTINE PSPBTRS( UPLO, N, BW, NRHS, A, JA, DESCA, B, IB, DESCB, AF, LAF,  WORK,  LWORK,
                           INFO )

           CHARACTER       UPLO

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

           INTEGER         DESCA( * ), DESCB( * )

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

PURPOSE

       PSPBTRS solves a system of linear equations

       where   A(1:N,   JA:JA+N-1)   is  the  matrix  used  to  produce  the  factors  stored  in
       A(1:N,JA:JA+N-1) and AF by PSPBTRF.
       A(1:N, JA:JA+N-1) is an N-by-N real
       banded symmetric positive definite distributed
       matrix with bandwidth BW.
       Depending on the value of UPLO, A stores either U or L in the  equn  A(1:N,  JA:JA+N-1)  =
       U'*U or L*L' as computed by PSPBTRF.

       Routine PSPBTRF MUST be called first.