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



NAME
       PCPTTRSV  -  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 PCPTTRSV( UPLO, TRANS, N, NRHS, D,  E,  JA,  DESCA,  B,  IB,
                            DESCB, AF, LAF, WORK, LWORK, INFO )

           CHARACTER        TRANS, UPLO

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

           INTEGER          DESCA( * ), DESCB( * )

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

           REAL             D( * )

PURPOSE
       PCPTTRSV  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)^H * 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 PCPTTRF
       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 PCPTTRF MUST be called first.




ScaLAPACK routine               31 October 2017                    PCPTTRSV(3)