CPPCON man page on RedHat

Man page or keyword search:  
man Server   29550 pages
apropos Keyword Search (all sections)
Output format
RedHat logo
[printable version]

cppcon.f(3)			    LAPACK			   cppcon.f(3)

NAME
       cppcon.f -

SYNOPSIS
   Functions/Subroutines
       subroutine cppcon (UPLO, N, AP, ANORM, RCOND, WORK, RWORK, INFO)
	   CPPCON

Function/Subroutine Documentation
   subroutine cppcon (characterUPLO, integerN, complex, dimension( * )AP,
       realANORM, realRCOND, complex, dimension( * )WORK, real, dimension( *
       )RWORK, integerINFO)
       CPPCON

       Purpose:

	    CPPCON estimates the reciprocal of the condition number (in the
	    1-norm) of a complex Hermitian positive definite packed matrix using
	    the Cholesky factorization A = U**H*U or A = L*L**H computed by
	    CPPTRF.

	    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 COMPLEX array, dimension (N*(N+1)/2)
		     The triangular factor U or L from the Cholesky factorization
		     A = U**H*U or A = L*L**H, 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 REAL
		     The 1-norm (or infinity-norm) of the Hermitian matrix A.

	   RCOND

		     RCOND is REAL
		     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 COMPLEX array, dimension (2*N)

	   RWORK

		     RWORK is REAL 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 cppcon.f.

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

Version 3.4.2			Tue Sep 25 2012			   cppcon.f(3)
[top]

List of man pages available for RedHat

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net