 [i])     template<class E>     BOOST_UBLAS_INLINE     typename vector_unary_traits<E, scalar_abs<typename E::value_type> >::result_type     abs (const vector_expression<E> &e) {         typedef typename vector_unary_traits<E, scalar_abs<typename E::value_type> >::expression_type expression_type;         return expression_type (e ());     }      