dlasq6.f - Online Linux Manual Page

Section : 3
Updated : Tue Nov 14 2017
Source : Version 3.8.0
Note : LAPACK
NAMEdlasq6.f
SYNOPSIS
Functions/Subroutinessubroutine dlasq6 (I0, N0, Z, PP, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2)
DLASQ6 computes one dqd transform in ping-pong form​. Used by sbdsqr and sstegr​.
Function/Subroutine Documentation
subroutine dlasq6 (integer I0, integer N0, double precision, dimension( * ) Z, integer PP, double precision DMIN, double precision DMIN1, double precision DMIN2, double precision DN, double precision DNM1, double precision DNM2)DLASQ6 computes one dqd transform in ping-pong form​. Used by sbdsqr and sstegr​. Purpose: DLASQ6 computes one dqd (shift equal to zero) transform in ping-pong form, with protection against underflow and overflow.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.
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).Author: Univ​. of Tennessee Univ​. of California Berkeley Univ​. of Colorado Denver NAG Ltd​. Date: December 2016 Definition at line 121 of file dlasq6​.f​.
AuthorGenerated automatically by Doxygen for LAPACK from the source code​. 0
Johanes Gumabo
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