I've used The Pragmatic Programmer's Guide for most my work in ruby.
However, it doesn't contain listings of all the classes. ri is a good
reference to have, but that also lacks some info (I can't seem to find
the Matrix class in any of these for instance)

What's the most full documentation out there?

db

-- 
A.D. 1844: Samuel Morse invents Morse code. Cryptography export
restrictions prevent the telegraph's use outside the U.S. and Canada.