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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
	dlapll(l)

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DLAPLL

NAME
SYNOPSIS
PURPOSE
ARGUMENTS

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NAME

DLAPLL - two column vectors X and Y, let A = ( X Y )

SYNOPSIS

	SUBROUTINE DLAPLL(		N, X, INCX, Y, INCY, SSMIN )
	INTEGER		INCX, INCY, N
	DOUBLE		PRECISION SSMIN
	DOUBLE		PRECISION X( * ), Y( * )

PURPOSE

Given two column vectors X and Y, let A = ( X Y ). The subroutine first computes the QR factorization of A = Q*R, and then computes the SVD of the 2-by-2 upper triangular matrix R. The smaller singular value of R is returned in SSMIN, which is used as the measurement of the linear dependency of the vectors X and Y.

ARGUMENTS

N (input) INTEGER

The length of the vectors X and Y.

X (input/output) DOUBLE PRECISION array,

dimension (1+(N-1)*INCX) On entry, X contains the N-vector X. On exit, X is overwritten.

INCX (input) INTEGER

The increment between successive elements of X. INCX > 0.

Y (input/output) DOUBLE PRECISION array,

dimension (1+(N-1)*INCY) On entry, Y contains the N-vector Y. On exit, Y is overwritten.

INCY (input) INTEGER

The increment between successive elements of Y. INCY > 0.

SSMIN (output) DOUBLE PRECISION

The smallest singular value of the N-by-2 matrix A = ( X Y ).

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dlapll(l)