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PZDTTRF

PZDTTRF

Section: LAPACK routine (version 1.5) (l) Updated: 12 May 1997
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NAME

PZDTTRF - compute a LU factorization of an N-by-N complex tridiagonal diagonally dominant-like distributed matrix A(1:N, JA:JA+N-1)  

SYNOPSIS

SUBROUTINE PZDTTRF(
N, DL, D, DU, JA, DESCA, AF, LAF, WORK, LWORK, INFO )

    
INTEGER INFO, JA, LAF, LWORK, N

    
INTEGER DESCA( * )

    
COMPLEX*16 AF( * ), D( * ), DL( * ), DU( * ), WORK( * )
 

PURPOSE

PZDTTRF computes a LU factorization of an N-by-N complex tridiagonal diagonally dominant-like distributed matrix A(1:N, JA:JA+N-1). Reordering is used to increase parallelism in the factorization. This reordering results in factors that are DIFFERENT from those produced by equivalent sequential codes. These factors cannot be used directly by users; however, they can be used in
subsequent calls to PZDTTRS to solve linear systems.

The factorization has the form


        P A(1:N, JA:JA+N-1) P^T = L U

where U is a tridiagonal upper triangular matrix and L is tridiagonal lower triangular, and P is a permutation matrix.


 

Index

NAME
SYNOPSIS
PURPOSE

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