dlasq5.f - Online Linux Manual Page

Section : 3
Updated : Tue Nov 14 2017
Source : Version 3.8.0
Note : LAPACK
NAMEdlasq5.f
SYNOPSIS
Functions/Subroutinessubroutine dlasq5 (I0, N0, Z, PP, TAU, SIGMA, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2, IEEE, EPS)
DLASQ5 computes one dqds transform in ping-pong form​. Used by sbdsqr and sstegr​.
Function/Subroutine Documentation
subroutine dlasq5 (integer I0, integer N0, double precision, dimension( * ) Z, integer PP, double precision TAU, double precision SIGMA, double precision DMIN, double precision DMIN1, double precision DMIN2, double precision DN, double precision DNM1, double precision DNM2, logical IEEE, double precision EPS)DLASQ5 computes one dqds transform in ping-pong form​. Used by sbdsqr and sstegr​. Purpose: DLASQ5 computes one dqds transform in ping-pong form, one version for IEEE machines another for non IEEE machines.Parameters: I0 I0 is INTEGER First index.
N0 N0 is INTEGER Last index.
Z Z is DOUBLE PRECISION array, dimension ( 4*N ) Z holds the qd array. EMIN is stored in Z(4*N0) to avoid an extra argument.
PP PP is INTEGER PP=0 for ping, PP=1 for pong.
TAU TAU is DOUBLE PRECISION This is the shift.
SIGMA SIGMA is DOUBLE PRECISION This is the accumulated shift up to this step.
DMIN DMIN is DOUBLE PRECISION Minimum value of d.
DMIN1 DMIN1 is DOUBLE PRECISION Minimum value of d, excluding D( N0 ).
DMIN2 DMIN2 is DOUBLE PRECISION Minimum value of d, excluding D( N0 ) and D( N0-1 ).
DN DN is DOUBLE PRECISION d(N0), the last value of d.
DNM1 DNM1 is DOUBLE PRECISION d(N0-1).
DNM2 DNM2 is DOUBLE PRECISION d(N0-2).
IEEE IEEE is LOGICAL Flag for IEEE or non IEEE arithmetic.
EPS EPS is DOUBLE PRECISION This is the value of epsilon used.Author: Univ​. of Tennessee Univ​. of California Berkeley Univ​. of Colorado Denver NAG Ltd​. Date: June 2017 Definition at line 146 of file dlasq5​.f​.
AuthorGenerated automatically by Doxygen for LAPACK from the source code​. 0
Johanes Gumabo
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