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RedHat 9 (Linux i386) - man page for cpotf2 (redhat section l)

CPOTF2(l)					)					CPOTF2(l)

NAME
       CPOTF2  -  compute  the	Cholesky  factorization  of a complex Hermitian positive definite
       matrix A

SYNOPSIS
       SUBROUTINE CPOTF2( UPLO, N, A, LDA, INFO )

	   CHARACTER	  UPLO

	   INTEGER	  INFO, LDA, N

	   COMPLEX	  A( LDA, * )

PURPOSE
       CPOTF2 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 array, dimension (LDA,N)
	       On entry, the Hermitian matrix A.  If UPLO = 'U', the leading n by n upper  trian-
	       gular  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.

LAPACK version 3.0			   15 June 2000 				CPOTF2(l)


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