.TH PSDTTRSV l "12 May 1997" "LAPACK version 1.5" "LAPACK routine (version 1.5)"
.SH NAME
PSDTTRSV \- solve a tridiagonal triangular system of linear equations   A(1:N, JA:JA+N-1) * X = B(IB:IB+N-1, 1:NRHS)
.SH SYNOPSIS
.TP 21
SUBROUTINE PSDTTRSV(
UPLO, TRANS, N, NRHS, DL, D, DU, JA, DESCA,
B, IB, DESCB, AF, LAF, WORK, LWORK, INFO )
.TP 21
.ti +4
CHARACTER
TRANS, UPLO
.TP 21
.ti +4
INTEGER
IB, INFO, JA, LAF, LWORK, N, NRHS
.TP 21
.ti +4
INTEGER
DESCA( * ), DESCB( * )
.TP 21
.ti +4
REAL
AF( * ), B( * ), D( * ), DL( * ), DU( * ),
WORK( * )
.SH PURPOSE
PSDTTRSV solves a tridiagonal triangular system of linear equations
                               or
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                    A(1:N, JA:JA+N-1)^T * X = B(IB:IB+N-1, 1:NRHS)

where A(1:N, JA:JA+N-1) is a tridiagonal
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triangular matrix factor produced by the
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Gaussian elimination code PS@(dom_pre)TTRF
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and is stored in A(1:N,JA:JA+N-1) and AF.
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The matrix stored in A(1:N, JA:JA+N-1) is either
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upper or lower triangular according to UPLO,
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and the choice of solving A(1:N, JA:JA+N-1) or A(1:N, JA:JA+N-1)^T
is dictated by the user by the parameter TRANS.
.br

Routine PSDTTRF MUST be called first.
.br