Flashnux

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Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :

ISBN : 978-2-7460-9712-4
EAN : 9782746097124
(Editions ENI)

GNU/Linux	CentOS 4.8	i386
	dlasq3(l)

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DLASQ3

NAME
SYNOPSIS
PURPOSE
ARGUMENTS

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NAME

DLASQ3 - check for deflation, computes a shift (TAU) and calls dqds

SYNOPSIS

	SUBROUTINE DLASQ3(		I0, N0, Z, PP, DMIN, SIGMA, DESIG, QMAX, NFAIL, ITER, NDIV, IEEE )
	LOGICAL		IEEE
	INTEGER		I0, ITER, N0, NDIV, NFAIL, PP
	DOUBLE		PRECISION DESIG, DMIN, QMAX, SIGMA
	DOUBLE		PRECISION Z( * )

PURPOSE

DLASQ3 checks for deflation, computes a shift (TAU) and calls dqds. In case of failure it changes shifts, and tries again until output is positive.

ARGUMENTS

I0 (input) INTEGER

First index.

N0 (input) INTEGER

Last index.

Z (input) DOUBLE PRECISION array, dimension ( 4*N )

Z holds the qd array.

PP (input) INTEGER

PP=0 for ping, PP=1 for pong.

DMIN (output) DOUBLE PRECISION

Minimum value of d.

SIGMA (output) DOUBLE PRECISION

Sum of shifts used in current segment.

DESIG (input/output) DOUBLE PRECISION

Lower order part of SIGMA

QMAX (input) DOUBLE PRECISION

Maximum value of q.

NFAIL (output) INTEGER

Number of times shift was too big.

ITER (output) INTEGER

Number of iterations.

NDIV (output) INTEGER

Number of divisions.

TTYPE (output) INTEGER

Shift type.

IEEE (input) LOGICAL

Flag for IEEE or non IEEE arithmetic (passed to DLASQ5).

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dlasq3(l)