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Hi folks, I've been working on some additions to the scipy.signal module. A significant portion of my work involves dealing with linear systems in the discrete-time domain, but I found that most of the functionality I would need in scipy is implemented only in the continuous domain. I've therefore added some code to handle the discrete time cases. My fork is visible at: https://github.com/ArmstrongJ/scipy Additionally, I presented at PyCon 2011, and I briefly discussed a discrete algebraic Riccati equation solver I had implemented in Python. I've included that code into scipy.signal along with a continuous implementation. I'd appreciate some comments and review of the code. Everything seems to be working for me at this point, but any constructive criticism is greatly appreciated. -Jeff Jeff Armstrong - jba@sdf.lonestar.org SDF Public Access UNIX System - http://sdf.lonestar.org