code: def predefined(self, y0, xout, params=(), **kwargs):
          
          xout, yout, info = self.integrate(xout, y0, params=params,
                                            force_predefined=True, **kwargs)
          return yout, info
docs: Integrate with user chosen output.
  
          Parameters
          ----------
          integrator : str
              See :meth:`integrate`.
          y0 : array_like
              See :meth:`integrate`.
          xout : array_like
          params : array_like
              See :meth:`integrate`.
          \*\*kwargs:
              See :meth:`integrate`
  
          Returns
          -------
          Length 2 tuple : (yout, info)
              See :meth:`integrate`.