def rmatrix(self):
center = self._center
mat = Element.rmatrix(self)
mat[3:] = array((center.x, center.y, center.z, 1.0), "d")
return mat
def rmatrix(self):
mat=Element.rmatrix(self)
mat[3:]=array([[0.0,0.0,0.0,1.0]])
return mat
