hello, this might be a dumb question, if so, sorry for my ignorance, but my math is rusted, and I'm a completly newbie (to Python), I haven't even installed Python on my computer yet ;-) I'm evaluating some packages for easy data-acquisition and (real-time) data-analysis, specific for bio-physical signals (e.g. ECG, EOG, etc). I've seen LabView and threw it in the recycle bin. I've seen MatLab and decided it needed a user friendly wrapper, after which it looks quit powerfull. After my positive experiences with MatLab scripting (didn't realize scripting could be so fast), I searched for more and found 2 other interesting packages (both open source), - SciLab : almost identical to MatLab, and with an equivalent Simulation module - Python + huge collection of tools : suited for a wide range of platforms, even for small PIC micro controllers I quickly read some documents about NumPy and SciPy, and most functions I need are there, even the clip function which is missing in MatLab. But I couldn't find the equivalent of the MatLab "filter" function: y = filter(b,a,X) The filter function is implemented as a direct form II transposed structure, y(n) = b(1)*x(n) + b(2)*x(n-1) + ... + b(nb+1)*x(n-nb) - a(2)*y(n-1) - ... - a(na+1)*y(n-na) Is there a Python equivalent to this filter function ? I tried to look in the archives of this mailinglist, but that's not a job for humans. (btw, does anyone has the complete list archive in Thunderbird format ?) What I also couldn't find ( I do admit that Python information is overwhelming, but maybe that's the problem for newbies) is there a toolbox to generate the filter polynomes ? thanks, Stef Mientki