dlarrc man page on Scientific

Man page or keyword search:  
man Server   26626 pages
apropos Keyword Search (all sections)
Output format
Scientific logo
[printable version]

DLARRC(1)	    LAPACK auxiliary routine (version 3.2)	     DLARRC(1)

NAME
       DLARRC  - the number of eigenvalues of the symmetric tridiagonal matrix
       T that are in the interval (VL,VU] if JOBT = 'T', and of	 L  D  L^T  if
       JOBT = 'L'

SYNOPSIS
       SUBROUTINE DLARRC( JOBT,	 N,  VL, VU, D, E, PIVMIN, EIGCNT, LCNT, RCNT,
			  INFO )

	   CHARACTER	  JOBT

	   INTEGER	  EIGCNT, INFO, LCNT, N, RCNT

	   DOUBLE	  PRECISION PIVMIN, VL, VU

	   DOUBLE	  PRECISION D( * ), E( * )

PURPOSE
       Find the number of eigenvalues of the symmetric	tridiagonal  matrix  T
       that  are in the interval (VL,VU] if JOBT = 'T', and of L D L^T if JOBT
       = 'L'.

ARGUMENTS
       JOBT    (input) CHARACTER*1
	       = 'T':  Compute Sturm count for matrix T.
	       = 'L':  Compute Sturm count for matrix L D L^T.

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

       VL      (input) DOUBLE PRECISION
	       VU      (input) DOUBLE PRECISION The lower and upper bounds for
	       the eigenvalues.

       D       (input) DOUBLE PRECISION array, dimension (N)
	       JOBT  =	'T': The N diagonal elements of the tridiagonal matrix
	       T.
	       JOBT = 'L': The N diagonal elements of the diagonal matrix D.

       E       (input) DOUBLE PRECISION array, dimension (N)
	       JOBT = 'T': The N-1 offdiagonal elements of the matrix T.
	       JOBT = 'L': The N-1 offdiagonal elements of the matrix L.

       PIVMIN  (input) DOUBLE PRECISION
	       The minimum pivot in the Sturm sequence for T.

       EIGCNT  (output) INTEGER
	       The number of eigenvalues of the symmetric tridiagonal matrix T
	       that are in the interval (VL,VU]

       LCNT    (output) INTEGER
	       RCNT	(output)  INTEGER  The left and right negcounts of the
	       interval.

       INFO    (output) INTEGER

FURTHER DETAILS
       Based on contributions by
	  Beresford Parlett, University of California, Berkeley, USA
	  Jim Demmel, University of California, Berkeley, USA
	  Inderjit Dhillon, University of Texas, Austin, USA
	  Osni Marques, LBNL/NERSC, USA
	  Christof Voemel, University of California, Berkeley, USA

 LAPACK auxiliary routine (versioNovember 2008			     DLARRC(1)
[top]

List of man pages available for Scientific

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