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dlassq examples
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Man Page Details
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NAME
       DLASSQ  -  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 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) 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.

