Source of <butter.m>?

[edA-qa mort-ora-y]

A little bit off-topic but: Can anybody here direct me to a good book or 
tutorial that would be able to recreate the "butter" function from scratch?

I've implemented an IIR filter to use the result of these Butterworth 
values, but I'd ideally like to have the calculation directly in the 
program (it is C++) -- also just for the purpose of knowing myself I 
want to learn it.

P.S. I've already gone through several DSP references and have a good 
idea on how to analyze filters, how to use the H(s) /z-transform, but 
I'm just getting confused trying to pull it all together into producing 
usable IIR filters... :(


--
edA-qa mort-ora-y
Idea Architect
http://disemia.com/



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