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
	slasq3(l)

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SLASQ3

NAME
SYNOPSIS
PURPOSE
ARGUMENTS

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NAME

SLASQ3 - check for deflation, computes a shift (TAU) and calls dqds

SYNOPSIS

	SUBROUTINE SLASQ3(		I0, N0, Z, PP, DMIN, SIGMA, DESIG, QMAX, NFAIL, ITER, NDIV, IEEE )
	LOGICAL		IEEE
	INTEGER		I0, ITER, N0, NDIV, NFAIL, PP
	REAL		DESIG, DMIN, QMAX, SIGMA
	REAL		Z( * )

PURPOSE

SLASQ3 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) REAL array, dimension ( 4*N )

Z holds the qd array.

PP (input) INTEGER

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

DMIN (output) REAL

Minimum value of d.

SIGMA (output) REAL

Sum of shifts used in current segment.

DESIG (input/output) REAL

Lower order part of SIGMA

QMAX (input) REAL

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 SLASQ5).

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slasq3(l)