SLASQ6(l) ) SLASQ6(l)
NAME
SLASQ6 - compute one dqd (shift equal to zero) transform in ping-pong form, with protection against underflow and overflow
SYNOPSIS
SUBROUTINE SLASQ6( I0, N0, Z, PP, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2 )
INTEGER I0, N0, PP
REAL DMIN, DMIN1, DMIN2, DN, DNM1, DNM2
REAL Z( * )
PURPOSE
SLASQ6 computes one dqd (shift equal to zero) transform in ping-pong form, with protection against underflow and overflow.
ARGUMENTS
I0 (input) INTEGER
First index.
N0 (input) INTEGER
Last index.
Z (input) REAL array, dimension ( 4*N )
Z holds the qd array. EMIN is stored in Z(4*N0) to avoid an extra argument.
PP (input) INTEGER
PP=0 for ping, PP=1 for pong.
DMIN (output) REAL
Minimum value of d.
DMIN1 (output) REAL Minimum value of d, excluding D( N0 ).
DMIN2 (output) REAL Minimum value of d, excluding D( N0 ) and D( N0-1 ).
DN (output) REAL
d(N0), the last value of d.
DNM1 (output) REAL
d(N0-1).
DNM2 (output) REAL
d(N0-2).
LAPACK version 3.0 15 June 2000 SLASQ6(l)
Check Out this Related Man Page
slasq5.f(3) LAPACK slasq5.f(3)NAME
slasq5.f -
SYNOPSIS
Functions/Subroutines
subroutine slasq5 (I0, N0, Z, PP, TAU, SIGMA, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2, IEEE, EPS)
SLASQ5 computes one dqds transform in ping-pong form. Used by sbdsqr and sstegr.
Function/Subroutine Documentation
subroutine slasq5 (integerI0, integerN0, real, dimension( * )Z, integerPP, realTAU, realSIGMA, realDMIN, realDMIN1, realDMIN2, realDN,
realDNM1, realDNM2, logicalIEEE, realEPS)
SLASQ5 computes one dqds transform in ping-pong form. Used by sbdsqr and sstegr.
Purpose:
SLASQ5 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 REAL 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 REAL
This is the shift.
DMIN
DMIN is REAL
Minimum value of d.
DMIN1
DMIN1 is REAL
Minimum value of d, excluding D( N0 ).
DMIN2
DMIN2 is REAL
Minimum value of d, excluding D( N0 ) and D( N0-1 ).
DN
DN is REAL
d(N0), the last value of d.
DNM1
DNM1 is REAL
d(N0-1).
DNM2
DNM2 is REAL
d(N0-2).
IEEE
IEEE is LOGICAL
Flag for IEEE or non IEEE arithmetic.
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
September 2012
Definition at line 132 of file slasq5.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 slasq5.f(3)
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