slasq6.f

Section: LAPACK (3)
Updated: Tue Nov 14 2017
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NAME

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 (integer I0, integer N0, real, dimension( * ) Z, integer PP, real DMIN, real DMIN1, real DMIN2, real DN, real DNM1, real DNM2)

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 is INTEGER
        First index.

          N0 is INTEGER
        Last index.

          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 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 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:

: December 2016

Definition at line 121 of file slasq6.f.

Author

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