[R] learning the R language (for those strong in Ruby)

[David C. James]

I feel like I'm not firing at all cylinders with the R language,  
despite reading over the R Language Definition.

Has anyone seen something like an "R for Rubyists" guide (i.e.  
teaching the R language for those who are more familar with Ruby)?

Alternately, a book with lots of examples about how the R language  
itself works would be fantastic.

-David