If you want to get involved, please drop by our mailing list or our IRC channel, #sciruby at chat.freenode.net. Please note that SciRuby and NMatrix require Ruby 1.9.2 or higher. Individual components may work with Ruby 1.8, but we may not be able to help you if you have trouble.
We're working to improve the documentation of the library with tutorials (see our blog) and RDoc comments. The one responsible for this is @agarie, so send him an e-mail or look for agarie on #sciruby at chat.freenode.net if you want to ask questions or offer suggestions