How to sum the value with negative values? Post: 302985869

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slassq.f

slassq.f(3)							      LAPACK							       slassq.f(3)

NAME

       slassq.f -

SYNOPSIS

   Functions/Subroutines
       subroutine slassq (N, X, INCX, SCALE, SUMSQ)
	   SLASSQ updates a sum of squares represented in scaled form.

Function/Subroutine Documentation
   subroutine slassq (integerN, real, dimension( * )X, integerINCX, realSCALE, realSUMSQ)
       SLASSQ updates a sum of squares represented in scaled form.

       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.

       Parameters:
	   N

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

	   X

		     X is 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

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

	   SCALE

		     SCALE is 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

		     SUMSQ is 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.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Definition at line 104 of file slassq.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2							  Tue Sep 25 2012						       slassq.f(3)