slasq5.f man page

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.

Referenced By

slasq5(3) is an alias of slasq5.f(3).

Sat Nov 16 2013 Version 3.4.2 LAPACK