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Man Pages


Manual Reference Pages  -  PSPBTRS (l)

NAME

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

CONTENTS

Synopsis
Purpose

SYNOPSIS

SUBROUTINE PSPBTRS( UPLO, N, BW, NRHS, A, JA, DESCA, B, IB, DESCB, AF, LAF, WORK, LWORK, INFO )
    CHARACTER UPLO
    INTEGER BW, IB, INFO, JA, LAF, LWORK, N, NRHS
    INTEGER DESCA( * ), DESCB( * )
    REAL A( * ), AF( * ), B( * ), WORK( * )

PURPOSE

PSPBTRS 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 produce the factors stored in A(1:N,JA:JA+N-1) and AF by PSPBTRF.
A(1:N, JA:JA+N-1) is an N-by-N real
banded symmetric positive definite distributed
matrix with bandwidth BW.
Depending on the value of UPLO, A stores either U or L in the equn A(1:N, JA:JA+N-1) = U’*U or L*L’ as computed by PSPBTRF.

Routine PSPBTRF MUST be called first.

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ScaLAPACK version 1.7 PSPBTRS (l) 13 August 2001

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