NAME

       dlarrr.f -

SYNOPSIS

   Functions/Subroutines
       subroutine dlarrr (N, D, E, INFO)
           DLARRR performs tests to decide whether the symmetric tridiagonal matrix T warrants expensive
           computations which guarantee high relative accuracy in the eigenvalues.

Function/Subroutine Documentation

   subroutine dlarrr (integerN, double precision, dimension( * )D, double precision, dimension( * )E,
       integerINFO)
       DLARRR performs tests to decide whether the symmetric tridiagonal matrix T warrants expensive
       computations which guarantee high relative accuracy in the eigenvalues.

       Purpose:

            Perform tests to decide whether the symmetric tridiagonal matrix T
            warrants expensive computations which guarantee high relative accuracy
            in the eigenvalues.

       Parameters:
           N

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

           D

                     D is DOUBLE PRECISION array, dimension (N)
                     The N diagonal elements of the tridiagonal matrix T.

           E

                     E is DOUBLE PRECISION array, dimension (N)
                     On entry, the first (N-1) entries contain the subdiagonal
                     elements of the tridiagonal matrix T; E(N) is set to ZERO.

           INFO

                     INFO is INTEGER
                     INFO = 0(default) : the matrix warrants computations preserving
                                         relative accuracy.
                     INFO = 1          : the matrix warrants computations guaranteeing
                                         only absolute accuracy.

       Author:
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Date:
           September 2012

       Contributors:
           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

       Definition at line 95 of file dlarrr.f.

Author

       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2                                    Wed Feb 26 2014                                     dlarrr.f(3)