def example_point(self):
        """
        Returns any single point guaranteed to be in the domain, but
        no other guarantees; useful for testing purposes.
        This is given as a size 1 ``np.array`` of type ``dtype``.

        :type: ``np.ndarray``
        """
        return np.array([([self.n_meas] + [0] * (self.n_elements-1),)], dtype=self.dtype)
Returns any single point guaranteed to be in the domain, but
        no other guarantees; useful for testing purposes.
        This is given as a size 1 ``np.array`` of type ``dtype``.

        :type: ``np.ndarray``