dlasq6.f (3) Linux Manual Page

dlasq6.f –

Synopsis

Functions/Subroutines

subroutine dlasq6 (I0, N0, Z, PP, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2)
DLASQ6 computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr.

Function/Subroutine Documentation

subroutine dlasq6 (integerI0, integerN0, double precision, dimension( * )Z, integerPP, double precisionDMIN, double precisionDMIN1, double precisionDMIN2, double precisionDN, double precisionDNM1, double precisionDNM2)

DLASQ6 computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr.

Purpose:

 DLASQ6 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 DOUBLE PRECISION 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 DOUBLE PRECISION

 Minimum value of d.

DMIN1

 DMIN1 is DOUBLE PRECISION

 Minimum value of d, excluding D( N0 ).

DMIN2

 DMIN2 is DOUBLE PRECISION

 Minimum value of d, excluding D( N0 ) and D( N0-1 ).

DN

 DN is DOUBLE PRECISION

 d(N0), the last value of d.

DNM1

 DNM1 is DOUBLE PRECISION

 d(N0-1).

DNM2

 DNM2 is DOUBLE PRECISION

 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 dlasq6.f.

Author

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