(property) Returns the list as a `numpy.ndarray`
                      (with dtype ``np.uint8``).

def v(self):
        """(property) Returns the list as a `numpy.ndarray`
                      (with dtype ``np.uint8``).
        """
        v = np.zeros(self.N, dtype=np.uint8)
        v[self.indices] = 1
        return v