How do you use the square root as operator in python? Dumb question, but thanks anyway, walter -- W.W. van den Broek e-mail: vandenbroek@psyd.azr.nl AZR-Dijkzigt fax: 010-4633217 afdeling psychiatrie tel: 010-4639222 Postbus 2040 e-mail vdbroekw@wxs.nl (thuis) 3000 CA Rotterdam homepage: http://home.planet.nl/~vdbroekw