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

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dppcon.f(3)				      LAPACK				      dppcon.f(3)

NAME
       dppcon.f -

SYNOPSIS
   Functions/Subroutines
       subroutine dppcon (UPLO, N, AP, ANORM, RCOND, WORK, IWORK, INFO)
	   DPPCON

Function/Subroutine Documentation
   subroutine dppcon (characterUPLO, integerN, double precision, dimension( * )AP, double
       precisionANORM, double precisionRCOND, double precision, dimension( * )WORK, integer,
       dimension( * )IWORK, integerINFO)
       DPPCON

       Purpose:

	    DPPCON estimates the reciprocal of the condition number (in the
	    1-norm) of a real symmetric positive definite packed matrix using
	    the Cholesky factorization A = U**T*U or A = L*L**T computed by
	    DPPTRF.

	    An estimate is obtained for norm(inv(A)), and the reciprocal of the
	    condition number is computed as RCOND = 1 / (ANORM * norm(inv(A))).

       Parameters:
	   UPLO

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

	   N

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

	   AP

		     AP is DOUBLE PRECISION array, dimension (N*(N+1)/2)
		     The triangular factor U or L from the Cholesky factorization
		     A = U**T*U or A = L*L**T, packed columnwise in a linear
		     array.  The j-th column of U or L is stored in the array AP
		     as follows:
		     if UPLO = 'U', AP(i + (j-1)*j/2) = U(i,j) for 1<=i<=j;
		     if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = L(i,j) for j<=i<=n.

	   ANORM

		     ANORM is DOUBLE PRECISION
		     The 1-norm (or infinity-norm) of the symmetric matrix A.

	   RCOND

		     RCOND is DOUBLE PRECISION
		     The reciprocal of the condition number of the matrix A,
		     computed as RCOND = 1/(ANORM * AINVNM), where AINVNM is an
		     estimate of the 1-norm of inv(A) computed in this routine.

	   WORK

		     WORK is DOUBLE PRECISION array, dimension (3*N)

	   IWORK

		     IWORK is INTEGER array, dimension (N)

	   INFO

		     INFO is INTEGER
		     = 0:  successful exit
		     < 0:  if INFO = -i, the i-th argument had an illegal value

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 119 of file dppcon.f.

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

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


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