CXML
        	    
LAPACK version 3.0
classq(3)

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

SYNTAX
  SUBROUTINE CLASSQ( N, X, INCX, SCALE, SUMSQ )

      INTEGER	     INCX, N

      REAL	     SCALE, SUMSQ

      COMPLEX	     X( * )

DESCRIPTION
  CLASSQ returns the values scl and ssq such that ( scl**2 )*ssq = x( 1 )**2
  +...+ x( n )**2 + ( scale**2 )*sumsq, where x( i ) = abs( X( 1 + ( i - 1
  )*INCX ) ). The value of sumsq is assumed to be at least unity and the
  value of ssq will then satisfy

     1.0 .le. ssq .le. ( sumsq + 2*n ).

  scale is assumed to be non-negative and scl returns the value

     scl = max( scale, abs( real( x( i ) ) ), abs( aimag( x( i ) ) ) ),
	    i

  scale and sumsq must be supplied in SCALE and SUMSQ respectively.  SCALE
  and SUMSQ are overwritten by scl and ssq 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) COMPLEX array, dimension (N)
	  The vector x as described above.  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 the value	 scl .

  SUMSQ	  (input/output) REAL
	  On entry, the value  sumsq  in the equation above.  On exit, SUMSQ
	  is overwritten with the value	 ssq .