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dlarrr.f(3) | LAPACK | dlarrr.f(3) |
NAME¶
dlarrr.f -SYNOPSIS¶
Functions/Subroutines¶
subroutine dlarrr (N, D, E, INFO)
Function/Subroutine Documentation¶
subroutine dlarrr (integerN, double precision, dimension( * )D, double precision, dimension( * )E, integerINFO)¶
DLARRR Purpose:Perform tests to decide whether the symmetric tridiagonal matrix T warrants expensive computations which guarantee high relative accuracy in the eigenvalues.
N
D
E
INFO
Author:
N is INTEGER The order of the matrix. N > 0.
D is DOUBLE PRECISION array, dimension (N) The N diagonal elements of the tridiagonal matrix T.
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 is INTEGER INFO = 0(default) : the matrix warrants computations preserving relative accuracy. INFO = 1 : the matrix warrants computations guaranteeing only absolute accuracy.
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011
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
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
Author¶
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