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

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