can you verify that all required modules are being loaded?
Also, when you try this, is it giving you any kind of output?
On the console, what kind of errors is it giving you?
If it does actually display something on the plot window, what is it showing (or just plotting nothing at all)
This is interesting to me, as i am also using pythonxy and moving from MatLab to Python (since Matlab refuses to support ATI GPUs...which are 3x better at integer math than Nvidia GPUs btw)
..i am also a bit new to Python, though not a n00b to programming by a long shot