DLARRR (3)  Linux Manuals
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.
DD is DOUBLE PRECISION array, dimension (N) The N diagonal elements of the tridiagonal matrix T.
EE is DOUBLE PRECISION array, dimension (N) On entry, the first (N1) entries contain the subdiagonal elements of the tridiagonal matrix T; E(N) is set to ZERO.
INFOINFO 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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