spotf2.f(3) [debian man page]

spotf2.f(3)							      LAPACK							       spotf2.f(3)

NAME

       spotf2.f -

SYNOPSIS

   Functions/Subroutines
       subroutine spotf2 (UPLO, N, A, LDA, INFO)
	   SPOTF2

Function/Subroutine Documentation
   subroutine spotf2 (characterUPLO, integerN, real, dimension( lda, * )A, integerLDA, integerINFO)
       SPOTF2

       Purpose:

	    SPOTF2 computes the Cholesky factorization of a real symmetric
	    positive definite matrix A.

	    The factorization has the form
	       A = U**T * U ,  if UPLO = 'U', or
	       A = L  * L**T,  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.

       Parameters:
	   UPLO

		     UPLO is CHARACTER*1
		     Specifies whether the upper or lower triangular part of the
		     symmetric matrix A is stored.
		     = 'U':  Upper triangular
		     = 'L':  Lower triangular

	   N

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

	   A

		     A is REAL 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
		     factorization A = U**T *U	or A = L*L**T.

	   LDA

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

	   INFO

		     INFO is 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.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 110 of file spotf2.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.1							  Sun May 26 2013						       spotf2.f(3)

Check Out this Related Man Page

SPOTF2(l)								 )								 SPOTF2(l)

NAME

       SPOTF2 - compute the Cholesky factorization of a real symmetric positive definite matrix A

SYNOPSIS

       SUBROUTINE SPOTF2( UPLO, N, A, LDA, INFO )

	   CHARACTER	  UPLO

	   INTEGER	  INFO, LDA, N

	   REAL 	  A( LDA, * )

PURPOSE

       SPOTF2 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) REAL 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 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 							 SPOTF2(l)

Linux and UNIX Man Pages

spotf2.f(3) [debian man page]

Check Out this Related Man Page