FYI, PythonCard contains a fairly elaborate turtle graphics library and set of samples that also happen to do plot, lineTo, etc. There are various samples plotting chaotic functions, coordinate grids, and fractals. There is even a generic plot sample that is a bit strange, but can plot any generic function since it uses eval to do its work. http://pythoncard.sourceforge.net/ Pictures of the turtle(s) (you can have any number of turtles you want) in action are at: http://pythoncard.sourceforge.net/samples2.html You can drive the turtle, do plotting, etc. from the shell or write a script. samples\turtle\test_turtle.py is the main program to run if you download PythonCard and want to try it out. PythonCard requires wxPython to run. The one thing it is really missing is an offscreen frame buffer, I just haven't had time to do it. Consequently, when you cover up the window, you lose the current drawing, but I'll fix that in the future unless somebody beats me to it. ka --- Kevin Altis altis@semi-retired.com