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



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
       A(1:N,     JA:JA+N-1)     *     X      =      B(IB:IB+N-1,      1:NRHS)
       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.




ScaLAPACK routine               31 October 2017                    PSPTTRSV(3)