dlasq6.f(3) LAPACK dlasq6.f(3)NAMEdlasq6.f-
SYNOPSIS
Functions/Subroutines
subroutine 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 (integerI0, integerN0, double precision, dimension( * )Z,
integerPP, double precisionDMIN, double precisionDMIN1, double
precisionDMIN2, double precisionDN, double precisionDNM1, double
precisionDNM2)
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:
September 2012
Definition at line 119 of file dlasq6.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 dlasq6.f(3)