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/home/abuild/rpmbuild/BUILD/lapack-3.12.0/SRC/slasq5.f(3) Library Functions Manual /home/abuild/rpmbuild/BUILD/lapack-3.12.0/SRC/slasq5.f(3)

NAME

/home/abuild/rpmbuild/BUILD/lapack-3.12.0/SRC/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 (integer i0, integer n0, real, dimension( * ) z, integer pp, real tau, real sigma, real dmin, real dmin1, real dmin2, real dn, real dnm1, real dnm2, logical ieee, real eps)

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.
!>

SIGMA

!>          SIGMA is REAL
!>        This is the accumulated shift up to this step.
!>

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.
!>

EPS

!>         EPS is REAL
!>        This is the value of epsilon used.
!>

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 142 of file slasq5.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Version 3.12.0 LAPACK