PZDTTRF(3)    ScaLAPACK routine of NEC Numeric Library Collection   PZDTTRF(3)



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). Reorder-
       ing  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.




ScaLAPACK routine               31 October 2017                     PZDTTRF(3)