PCPBTRSV(3)   ScaLAPACK routine of NEC Numeric Library Collection  PCPBTRSV(3)



NAME
       PCPBTRSV - 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 PCPBTRSV( UPLO, TRANS, N, BW, NRHS, A,  JA,  DESCA,  B,  IB,
                            DESCB, AF, LAF, WORK, LWORK, INFO )

           CHARACTER        TRANS, UPLO

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

           INTEGER          DESCA( * ), DESCB( * )

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

PURPOSE
       PCPBTRSV  solves  a banded triangular system of linear equations A(1:N,
       JA:JA+N-1) * X = B(IB:IB+N-1, 1:NRHS)                                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
       Cholesky factorization code PCPBTRF
       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 PCPBTRF MUST be called first.




ScaLAPACK routine               31 October 2017                    PCPBTRSV(3)