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CentOS 7.0 - man page for dla_porpvgrw (centos section 3)

dla_porpvgrw.f(3)			      LAPACK				dla_porpvgrw.f(3)

NAME
       dla_porpvgrw.f -

SYNOPSIS
   Functions/Subroutines
       DOUBLE PRECISION function dla_porpvgrw (UPLO, NCOLS, A, LDA, AF, LDAF, WORK)
	   DLA_PORPVGRW computes the reciprocal pivot growth factor norm(A)/norm(U) for a
	   symmetric or Hermitian positive-definite matrix.

Function/Subroutine Documentation
   DOUBLE PRECISION function dla_porpvgrw (character*1UPLO, integerNCOLS, double precision,
       dimension( lda, * )A, integerLDA, double precision, dimension( ldaf, * )AF, integerLDAF,
       double precision, dimension( * )WORK)
       DLA_PORPVGRW computes the reciprocal pivot growth factor norm(A)/norm(U) for a symmetric
       or Hermitian positive-definite matrix.

       Purpose:

	    DLA_PORPVGRW computes the reciprocal pivot growth factor
	    norm(A)/norm(U). The "max absolute element" norm is used. If this is
	    much less than 1, the stability of the LU factorization of the
	    (equilibrated) matrix A could be poor. This also means that the
	    solution X, estimated condition numbers, and error bounds could be
	    unreliable.

       Parameters:
	   UPLO

		     UPLO is CHARACTER*1
		  = 'U':  Upper triangle of A is stored;
		  = 'L':  Lower triangle of A is stored.

	   NCOLS

		     NCOLS is INTEGER
		The number of columns of the matrix A. NCOLS >= 0.

	   A

		     A is DOUBLE PRECISION array, dimension (LDA,N)
		On entry, the N-by-N matrix A.

	   LDA

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

	   AF

		     AF is DOUBLE PRECISION array, dimension (LDAF,N)
		The triangular factor U or L from the Cholesky factorization
		A = U**T*U or A = L*L**T, as computed by DPOTRF.

	   LDAF

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

	   WORK

		     WORK is DOUBLE PRECISION array, dimension (2*N)

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Definition at line 106 of file dla_porpvgrw.f.

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

Version 3.4.2				 Tue Sep 25 2012			dla_porpvgrw.f(3)


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