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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
	cpotrf(l)

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CPOTRF

NAME
SYNOPSIS
PURPOSE
ARGUMENTS

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NAME

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

SYNOPSIS

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

PURPOSE

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

This is the block version of the algorithm, calling Level 3 BLAS.

ARGUMENTS

UPLO (input) CHARACTER*1

= ’U’: Upper triangle of A is stored;
= ’L’: Lower triangle of A is stored.

N (input) INTEGER

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

A (input/output) COMPLEX 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**H*U or A = L*L**H.

LDA (input) INTEGER

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

INFO (output) INTEGER

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

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cpotrf(l)