def values(self):
    """
    Array values generator for powers from zero to upper power. Useful to cast
    as list/tuple and for numpy/scipy integration (be careful: numpy use the
    reversed from the output of this function used as input to a list or a
    tuple constructor).
    """
    if self._data:
      for key in xrange(self.order + 1):
        yield self[key]
Array values generator for powers from zero to upper power. Useful to cast
    as list/tuple and for numpy/scipy integration (be careful: numpy use the
    reversed from the output of this function used as input to a list or a
    tuple constructor).