improve_solutions
=================

.. py:function:: luminet.solver.improve_solutions(func: Callable, x: numpy.ndarray, y: numpy.ndarray, kwargs: Dict) -> numpy.ndarray

   Find the root of a function.

   Uses brentq to find the root of a function.

   :Parameters: * **func** (*Callable*) -- function to find the root of
                * **x** (*np.ndarray*) -- x values
                * **y** (*np.ndarray*) -- y values
                * **kwargs** (*Dict*) -- keyword arguments for the function

   :returns: *float* -- Root of the function i.e. where :math:`y = 0`