dcombssq()

subroutine dcombssq	(	double precision, dimension( 2 )	v1,
		double precision, dimension( 2 )	v2
	)

Definition at line 258 of file pdtreecomb.f.

*
*  -- ScaLAPACK tools routine (version 1.7) --
*     University of Tennessee, Knoxville, Oak Ridge National Laboratory,
*     and University of California, Berkeley.
*     May 1, 1997
*
*     .. Array Arguments ..
      DOUBLE PRECISION   V1( 2 ), V2( 2 )
*     ..
*
*  Purpose
*  =======
*
*  DCOMBSSQ does a scaled sum of squares on two scalars.
*
*  Arguments
*  =========
*
*  V1        (local input/local output) DOUBLE PRECISION array of
*            dimension 2.  The first scaled sum. V1(1) = SCALE,
*            V1(2) = SUMSQ.
*
*  V2        (local input) DOUBLE PRECISION array of dimension 2.
*            The second scaled sum. V2(1) = SCALE, V2(2) = SUMSQ.
*
*  =====================================================================
*
*     .. Parameters ..
      DOUBLE PRECISION   ZERO
      parameter( zero = 0.0d+0 )
*     ..
*     .. Executable Statements ..
*
      IF( v1( 1 ).GE.v2( 1 ) ) THEN
         IF( v1( 1 ).NE.zero )
     $      v1( 2 ) = v1( 2 ) + ( v2( 1 ) / v1( 1 ) )**2 * v2( 2 )
      ELSE
         v1( 2 ) = v2( 2 ) + ( v1( 1 ) / v2( 1 ) )**2 * v1( 2 )
         v1( 1 ) = v2( 1 )
      END IF
*
      RETURN
*
*     End of DCOMBSSQ
*

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