Hi Is it okay to implement the functions, name-wise, as it is done in Matlab. For example, say the series function in Matlab is implemented as : series(first param, second param). Is it okay to use the same function names? I think it's okay, but as I have never done this before, I am not sure. Also, this has the added advantage of easy portability of code across from Matlab, and lesser learning curve (if any). I've got my books out, and hope to have some results soon. The whole control systems module seems 'very doable' right now :) Regards, Venkat