PDDTTRS

Section: LAPACK routine (version 1.5) (l) Updated: 12 May 1997 Local index Up

NAME

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

SYNOPSIS

SUBROUTINE PDDTTRS(: TRANS, N, NRHS, DL, D, DU, JA, DESCA, B, IB, DESCB, AF, LAF, WORK, LWORK, INFO )
: CHARACTER TRANS
: INTEGER IB, INFO, JA, LAF, LWORK, N, NRHS
: INTEGER DESCA( * ), DESCB( * )
: DOUBLE PRECISION AF( * ), B( * ), D( * ), DL( * ), DU( * ), WORK( * )

PURPOSE

PDDTTRS solves a system of linear equations
or

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 produce the factors stored in A(1:N,JA:JA+N-1) and AF by PDDTTRF.
A(1:N, JA:JA+N-1) is an N-by-N real
tridiagonal diagonally dominant-like distributed
matrix.

Routine PDDTTRF MUST be called first.

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