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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
	slassq(l)

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SLASSQ

NAME
SYNOPSIS
PURPOSE
ARGUMENTS

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NAME

SLASSQ - return the values scl and smsq such that ( scl**2 )*smsq = x( 1 )**2 +...+ x( n )**2 + ( scale**2 )*sumsq,

SYNOPSIS

	SUBROUTINE SLASSQ(		N, X, INCX, SCALE, SUMSQ )
	INTEGER		INCX, N
	REAL		SCALE, SUMSQ
	REAL		X( * )

PURPOSE

SLASSQ returns the values scl and smsq such that ( scl**2 )*smsq = x( 1 )**2 +...+ x( n )**2 + ( scale**2 )*sumsq, where x( i ) = X( 1 + ( i - 1 )*INCX ). The value of sumsq is assumed to be non-negative and scl returns the value

scl = max( scale, abs( x( i ) ) ).

scale and sumsq must be supplied in SCALE and SUMSQ and
scl and smsq are overwritten on SCALE and SUMSQ respectively.

The routine makes only one pass through the vector x.

ARGUMENTS

N (input) INTEGER

The number of elements to be used from the vector X.

X (input) REAL array, dimension (N)

The vector for which a scaled sum of squares is computed. x( i ) = X( 1 + ( i - 1 )*INCX ), 1 <= i <= n.

INCX (input) INTEGER

The increment between successive values of the vector X. INCX > 0.

SCALE (input/output) REAL

On entry, the value scale in the equation above. On exit, SCALE is overwritten with scl , the scaling factor for the sum of squares.

SUMSQ (input/output) REAL

On entry, the value sumsq in the equation above. On exit, SUMSQ is overwritten with smsq , the basic sum of squares from which scl has been factored out.

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slassq(l)