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DLASSQ(3F)							    DLASSQ(3F)

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

SYNOPSIS
     SUBROUTINE DLASSQ( N, X, INCX, SCALE, SUMSQ )

	 INTEGER	INCX, N

	 DOUBLE		PRECISION SCALE, SUMSQ

	 DOUBLE		PRECISION X( * )

PURPOSE
     DLASSQ  returns the values	 scl  and  smsq	 such that

     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) DOUBLE PRECISION
	     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) DOUBLE PRECISION
	     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) DOUBLE PRECISION
	     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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