dlasq6.f File Reference

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Functions/Subroutines
subroutine	DLASQ6 (I0, N0, Z, PP, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2)
	DLASQ6

---

Function/Subroutine Documentation

subroutine DLASQ6	(	INTEGER	I0,
		INTEGER	N0,
		DOUBLE PRECISION, dimension( * )	Z,
		INTEGER	PP,
		DOUBLE PRECISION	DMIN,
		DOUBLE PRECISION	DMIN1,
		DOUBLE PRECISION	DMIN2,
		DOUBLE PRECISION	DN,
		DOUBLE PRECISION	DNM1,
		DOUBLE PRECISION	DNM2
	)

DLASQ6

Download DLASQ6 + dependencies [TGZ] [ZIP] [TXT]

Purpose:

 DLASQ6 computes one dqd (shift equal to zero) transform in
 ping-pong form, with protection against underflow and overflow.
 

Parameters:

[in]	I0	I0 is INTEGER First index.
[in]	N0	N0 is INTEGER Last index.
[in]	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.
[in]	PP	PP is INTEGER PP=0 for ping, PP=1 for pong.
[out]	DMIN	DMIN is DOUBLE PRECISION Minimum value of d.
[out]	DMIN1	DMIN1 is DOUBLE PRECISION Minimum value of d, excluding D( N0 ).
[out]	DMIN2	DMIN2 is DOUBLE PRECISION Minimum value of d, excluding D( N0 ) and D( N0-1 ).
[out]	DN	DN is DOUBLE PRECISION d(N0), the last value of d.
[out]	DNM1	DNM1 is DOUBLE PRECISION d(N0-1).
[out]	DNM2	DNM2 is DOUBLE PRECISION d(N0-2).

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

November 2011

Definition at line 119 of file dlasq6.f.

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