slarrr.f man page

slarrr.f —

Synopsis

Functions/Subroutines

subroutine slarrr (N, D, E, INFO)
SLARRR 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 slarrr (integerN, real, dimension( * )D, real, dimension( * )E, integerINFO)

SLARRR 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 REAL array, dimension (N)
The N diagonal elements of the tridiagonal matrix T.

E

E is REAL 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 slarrr.f.

Author

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Referenced By

slarrr(3) is an alias of slarrr.f(3).

Sat Nov 16 2013 Version 3.4.2 LAPACK