dpotf2 man page on YellowDog

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DPOTF2(l)			       )			     DPOTF2(l)

NAME
       DPOTF2  -  compute the Cholesky factorization of a real symmetric posi‐
       tive definite matrix A

SYNOPSIS
       SUBROUTINE DPOTF2( UPLO, N, A, LDA, INFO )

	   CHARACTER	  UPLO

	   INTEGER	  INFO, LDA, N

	   DOUBLE	  PRECISION A( LDA, * )

PURPOSE
       DPOTF2 computes the Cholesky factorization of a real symmetric 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
	       symmetric matrix A is stored.  = 'U':  Upper triangular
	       = 'L':  Lower triangular

       N       (input) INTEGER
	       The order of the matrix A.  N >= 0.

       A       (input/output) DOUBLE PRECISION array, dimension (LDA,N)
	       On entry, the symmetric 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  fac‐
	       torization 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			     DPOTF2(l)
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