There is a tutorial at OReilly which tries to do exactly this. http://www.oreillynet.com/topics/python/scientific -- Institut fuer Meereskunde phone: 49-431-597 3989 Dept. Theoretical Oceanography fax : 49-431-565876 Duesternbrooker Weg 20 email: jhauser at ifm.uni-kiel.de 24105 Kiel, Germany