man pddbtrs (Fonctions bibliothèques) - solve a system of linear equations A(1:N, JA:JA+N-1) * X = B(IB:IB+N-1, 1:NRHS)
NAME
PDDBTRS - solve a system of linear equations A(1:N, JA:JA+N-1) * X = B(IB:IB+N-1, 1:NRHS)
SYNOPSIS
- SUBROUTINE PDDBTRS(
- TRANS, N, BWL, BWU, NRHS, A, JA, DESCA, B, IB, DESCB, AF, LAF, WORK, LWORK, INFO )
- CHARACTER TRANS
- INTEGER BWL, BWU, IB, INFO, JA, LAF, LWORK, N, NRHS
- INTEGER DESCA( * ), DESCB( * )
- DOUBLE PRECISION A( * ), AF( * ), B( * ), WORK( * )
PURPOSE
PDDBTRS 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 PDDBTRF.
A(1:N, JA:JA+N-1) is an N-by-N real
banded diagonally dominant-like distributed
matrix with bandwidth BWL, BWU.
Routine PDDBTRF MUST be called first.