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

ZPOTRF(l)					)					ZPOTRF(l)

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

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

	   CHARACTER	  UPLO

	   INTEGER	  INFO, LDA, N

	   COMPLEX*16	  A( LDA, * )

PURPOSE
       ZPOTRF 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*16 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**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.

LAPACK version 3.0			   15 June 2000 				ZPOTRF(l)


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