Module RATQR in EISPACK

• EISPACK Information

• Components
  • Fullsource from NETLIB
  • Source from NETLIB

RATQR

 
Computes largest or smallest eigenvalues of symmetric tridiagonal matrix using
rational QR method with Newton correction.
 
Classes  :  D4a5 .  Tridiagonal matrix eigenvalue problems
            D4c2a . Compute eigenvalues of tridiagonal matrix
 
Type     : Fortran subroutine in EISPACK package.
Access   : Public domain. Portable.
Precision: Double.
Note     : Implementations vary among sites.
 
Usage    : CALL RATQR(N, EPS1, D, E, E2, M, W, IND, BD, TYPE, IDEF, IERR)
 
Details  : Fullsource Source
Sites    : (1) ARNO (2) NETLIB
 

Implementation of RATQR from EISPACK on ARNO

 
ARNO:      Silicon Graphics Origin 2000, National Institute of Standards and
           Technology (NIST), Gaithersburg, MD. Available to NIST staff.
 
Precision: Double.
Note     : Single precision version obtained by prepending s to name in call.
 
Those logged in to arno.nist.gov or amur.nist.gov may access this module as
follows.
 
   Access       : f77 -o prog prog.f -lcomplib.sgimath
   Documentation: man ratqr
 

Implementation of RATQR from EISPACK on NETLIB

 
NETLIB:    Public access repository, The University of Tennessee at
           Knoxville and Bell Laboratories
 
Precision: Double.
Note     : Single precision version available in NETLIB package SEISPACK.
 
You may access components from NETLIB outside GAMS as follows.
 
   Source       : echo "send only ratqr from eispack" | mail netlib@ornl.gov
   Fullsource   : echo "send ratqr from eispack" | mail netlib@ornl.gov