double val = op.apply(p, arg1);
double arg2 = arg_t.get(p); double val = op.apply(p, arg1, arg2);
	public void pointwise(DoubleArray res, Operator.Pointwise op) {	    assert res.distribution.equals(distribution);        /*         * the following assertions are limitation that are in the current         * implementation, not in the spec FIXME         */        assert res instanceof DoubleArray;                DoubleArray res_t = (DoubleArray) res;        for (Iterator it = distribution.region.iterator(); it.hasNext(); ) {			point p = (point) it.next();			double arg1 = get(p);			double val = op.apply(p, arg1);			res_t.set(val, p);		}	}