hi All, instead of questions, my first success story: I converted my first MatLab algorithm into Python (using SciPy), and it not only works perfectly, but also runs much faster: MatLab: 14 msec Python: 2 msec After taking the first difficult steps into Python, all kind of small problems as you already know, it nows seems a piece of cake to convert from MatLab to Python. (the final programs of MatLab and Python can almost only be distinguished by the comment character ;-) Especially I like: - more relaxed behavior of exceeded the upper limit of a (1-dimensional) array - much more functions available, like a simple "mean" - reducing datatype if it's allowed (booleans of 1 byte) thanks for all your help, probably need some more in the future, cheers, Stef Mientki