Hi folks from the cafe!! Last weekend, I was wondering on how hard it would be to use Haskell for mixed-signal processing. Here is an example of an digital integrator: summation=zipWith (+) delay xs=(fromIntegral 0):xs integrator xs=let ws=summation (integrator xs) xs in delay ws The input and output are infinite streams. I have a few questions: 1) Is it possible to change it to use arrows? How would it look like? 2) How would one implement an continuous time version? For 2) I would like to implement something like that digital integrator, so I could create filters based on integrator loops like this one: x(t) ----(+)----> Integrator --|---> y(t) ^ | |--------------------| Note that x(t) would be a function, and I would expect to create a function y, based on this flow! Rafael Gustavo da Cunha Pereira Pinto -- Rafael Gustavo da Cunha Pereira Pinto