psgbtrs(3)
NAME
PSGBTRS - solve a system of linear equations A(1:N, JA:JA+N-1) * X =
B(IB:IB+N-1, 1:NRHS)
SYNOPSIS
SUBROUTINE PSGBTRS( TRANS, N, BWL, BWU, NRHS, A, JA, DESCA, IPIV, B,
IB, DESCB, AF, LAF, WORK, LWORK, INFO )
CHARACTER TRANS
INTEGER BWU, BWL, IB, INFO, JA, LAF, LWORK, N, NRHS
INTEGER DESCA( * ), DESCB( * ), IPIV(*)
REAL A( * ), AF( * ), B( * ), WORK( * )
PURPOSE
- PSGBTRS 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 PSGBTRF.
A(1:N, JA:JA+N-1) is an N-by-N real
banded distributed
matrix with bandwidth BWL, BWU. - Routine PSGBTRF MUST be called first.