code: def weld_tail(array, length, n):
      
      obj_id, weld_obj = create_weld_object(array)
      if isinstance(length, WeldObject):
          length = get_weld_obj_id(weld_obj, length)
          slice_start = '{} - {}L'.format(length, n)
          slice_stop = '{}'.format(length)
      else:
          slice_start = '{}L - {}L'.format(length, n)
          slice_stop = '{}L'.format(length)
  
      weld_template = """slice(
      {array},
      {slice_start},
      {slice_stop}
  )"""
  
      weld_obj.weld_code = weld_template.format(array=obj_id,
                                                slice_start=slice_start,
                                                slice_stop=slice_stop)
  
      return weld_obj
docs: Return the last n elements.
  
      Parameters
      ----------
      array : numpy.ndarray or WeldObject
          Array to select from.
      length : int or WeldObject
          Length of the array. Int if already known can simplify the computation.
      n : int
          How many values.
  
      Returns
      -------
      WeldObject
          Representation of the computation.