slasq6.f man page

slasq6.f —

Synopsis

Functions/Subroutines

subroutine slasq6 (I0, N0, Z, PP, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2)
SLASQ6 computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr.

Function/Subroutine Documentation

subroutine slasq6 (integerI0, integerN0, real, dimension( * )Z, integerPP, realDMIN, realDMIN1, realDMIN2, realDN, realDNM1, realDNM2)

SLASQ6 computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr.

Purpose:

SLASQ6 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 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.

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).

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

September 2012

Definition at line 119 of file slasq6.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Referenced By

slasq6(3) is an alias of slasq6.f(3).

Sat Nov 16 2013 Version 3.4.2 LAPACK