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Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :

ISBN : 978-2-7460-9712-4
EAN : 9782746097124
(Editions ENI)

GNU/Linux	CentOS 4.8	i386
	zpotf2(l)

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ZPOTF2

NAME
SYNOPSIS
PURPOSE
ARGUMENTS

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NAME

ZPOTF2 - compute the Cholesky factorization of a complex Hermitian positive definite matrix A

SYNOPSIS

	SUBROUTINE ZPOTF2(		UPLO, N, A, LDA, INFO )
	CHARACTER		UPLO
	INTEGER		INFO, LDA, N
	COMPLEX*16		A( LDA, * )

PURPOSE

ZPOTF2 computes the Cholesky factorization of a complex Hermitian positive definite matrix A. The factorization has the form
A = U’ * U , if UPLO = ’U’, or
A = L * L’, if UPLO = ’L’,
where U is an upper triangular matrix and L is lower triangular.

This is the unblocked version of the algorithm, calling Level 2 BLAS.

ARGUMENTS

UPLO (input) CHARACTER*1

Specifies whether the upper or lower triangular part of the Hermitian matrix A is stored. = ’U’: Upper triangular
= ’L’: Lower triangular

N (input) INTEGER

The order of the matrix A. N >= 0.

A (input/output) COMPLEX*16 array, dimension (LDA,N)

On entry, the Hermitian matrix A. If UPLO = ’U’, the leading n by n upper triangular part of A contains the upper triangular part of the matrix A, and the strictly lower triangular part of A is not referenced. If UPLO = ’L’, the leading n by n lower triangular part of A contains the lower triangular part of the matrix A, and the strictly upper triangular part of A is not referenced.

On exit, if INFO = 0, the factor U or L from the Cholesky factorization A = U’*U or A = L*L’.

LDA (input) INTEGER

The leading dimension of the array A. LDA >= max(1,N).

INFO (output) INTEGER

= 0: successful exit
< 0: if INFO = -k, the k-th argument had an illegal value
> 0: if INFO = k, the leading minor of order k is not positive definite, and the factorization could not be completed.

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zpotf2(l)