/*!
     * \brief Element-wise mulitply two vectors 
     * A(i) = alpha*A(i) + beta*B(i)*C(i).
     */
    static void elementWiseMultiply( vector_type& A, const scalar_type& alpha,
				     const vector_type& B, const vector_type& C, 
				     const scalar_type& beta)
    { 
	A.elementWiseMultiply( beta, B, C, alpha );
    }