SYNOPSIS

SUBROUTINE PCDBTRSV(

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( * )

    

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

PURPOSE

PCDBTRSV solves a banded triangular system of linear equations
                               or

                    A(1:N, JA:JA+N-1)^H * 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 PC@(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)^H is dictated by the user by the parameter TRANS.

Routine PCDBTRF MUST be called first.