PZPTTRF(l) | LAPACK routine (version 1.5) | PZPTTRF(l) |
NAME¶
PZPTTRF - compute a Cholesky factorization of an N-by-N complex tridiagonal symmetric positive definite distributed matrix A(1:N, JA:JA+N-1)SYNOPSIS¶
- SUBROUTINE PZPTTRF(
- N, D, E, JA, DESCA, AF, LAF, WORK, LWORK, INFO )
PURPOSE¶
PZPTTRF computes a Cholesky factorization of an N-by-N complex tridiagonal symmetric positive definite 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 inP A(1:N, JA:JA+N-1) P^T = U' D U or
P A(1:N, JA:JA+N-1) P^T = L D L',
12 May 1997 | LAPACK version 1.5 |