PDPTTRSV(l) | LAPACK routine (version 1.5) | PDPTTRSV(l) |
NAME¶
PDPTTRSV - solve a tridiagonal triangular system of linear equations A(1:N, JA:JA+N-1) * X = B(IB:IB+N-1, 1:NRHS)SYNOPSIS¶
- SUBROUTINE PDPTTRSV(
- UPLO, N, NRHS, D, E, JA, DESCA, B, IB, DESCB, AF, LAF, WORK, LWORK, INFO )
PURPOSE¶
PDPTTRSV solves a tridiagonal triangular system of linear equations or 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
triangular matrix factor produced by the
Cholesky factorization code PDPTTRF
and is stored in A(1:N,JA:JA+N-1) and AF.
The matrix stored in A(1:N, JA:JA+N-1) is either
upper or lower triangular according to UPLO,
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.
Routine PDPTTRF MUST be called first.
12 May 1997 | LAPACK version 1.5 |