PCPTTRS(l) ) PCPTTRS(l)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 version 1.7 13 August 2001 PCPTTRS(l)
