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



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

SYNOPSIS
       SUBROUTINE PCPTTRS( 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( * )

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

           REAL            D( * )

PURPOSE
       PCPTTRS  solves  a  system  of linear equations A(1:N, JA:JA+N-1) * X =
       B(IB:IB+N-1, 1:NRHS) where A(1:N, JA:JA+N-1) is the matrix used to pro-
       duce the factors stored in A(1:N,JA:JA+N-1) and AF by PCPTTRF.
       A(1:N, JA:JA+N-1) is an N-by-N complex
       tridiagonal symmetric positive definite distributed
       matrix.
       Depending  on  the  value  of  UPLO, A stores either U or L in the equn
       A(1:N, JA:JA+N-1) = U'D *U or L*D L' as computed by PCPTTRF.

       Routine PCPTTRF MUST be called first.




ScaLAPACK routine               31 October 2017                     PCPTTRS(3)