'Set this transformation from the frozen copy of another
:class:`Affine2DBase` object.'

def set(self, other):

    if (not isinstance(other, Affine2DBase)):
        msg = u"'other'    must    be    an    instance    of    'matplotlib.transform.Affine2DBase'"
        raise ValueError(msg)
    self._mtx = other.get_matrix()
    self.invalidate()
