def _divide(self, x1, x2, out):
        """Compute the entry-wise quotient ``x1 / x2``.

        This function is part of the subclassing API. Do not
        call it directly.

        Parameters
        ----------
        x1, x2 : `NumpyTensor`
            Dividend and divisor in the quotient.
        out : `NumpyTensor`
            Element to which the result is written.

        Examples
        --------
        >>> space = odl.rn(3)
        >>> x = space.element([2, 0, 4])
        >>> y = space.element([1, 1, 2])
        >>> space.divide(x, y)
        rn(3).element([ 2.,  0.,  2.])
        >>> out = space.element()
        >>> result = space.divide(x, y, out=out)
        >>> result
        rn(3).element([ 2.,  0.,  2.])
        >>> result is out
        True
        """
        np.divide(x1.data, x2.data, out=out.data)