code: def singleaxis(self, apparent_zenith, apparent_azimuth):
          
          tracking_data = singleaxis(apparent_zenith, apparent_azimuth,
                                     self.axis_tilt, self.axis_azimuth,
                                     self.max_angle,
                                     self.backtrack, self.gcr)
  
          return tracking_data
docs: Get tracking data. See :py:func:`pvlib.tracking.singleaxis` more
          detail.
  
          Parameters
          ----------
          apparent_zenith : float, 1d array, or Series
              Solar apparent zenith angles in decimal degrees.
  
          apparent_azimuth : float, 1d array, or Series
              Solar apparent azimuth angles in decimal degrees.
  
          Returns
          -------
          tracking data