cpotf2 man page on Scientific

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CPOTF2(1)		 LAPACK routine (version 3.2)		     CPOTF2(1)

NAME
       CPOTF2  -  computes  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 posi‐
       tive 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 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.

 LAPACK routine (version 3.2)	 November 2008			     CPOTF2(1)
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