>>>>> "DG" == David Gobbi <dgobbi at imaging.robarts.ca> writes: DG> Hi Berk, What version of Python & which version of Numeric are DG> you using? Because what works for you, doesn't work for me DG> (Python 2.1, Numeric 11). Works for me: Python 2.1.3, Numeric 21.0, Linux. prabhu