## SYNOPSIS

- SUBROUTINE PDPTTRS(
- N, NRHS, D, E, JA, DESCA, B, IB, DESCB, AF, LAF, WORK, LWORK, INFO )

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

- INTEGER DESCA( * ), DESCB( * )

- DOUBLE PRECISION AF( * ), B( * ), D( * ), E( * ), WORK( * )

## PURPOSE

PDPTTRS solves a system of linear equations
where A(1:N, JA:JA+N-1) is the matrix used to produce the factors
stored in A(1:N,JA:JA+N-1) and AF by PDPTTRF.

A(1:N, JA:JA+N-1) is an N-by-N real

tridiagonal symmetric positive definite distributed

matrix.

Routine PDPTTRF MUST be called first.