[Rd] literate programming

[Terry Therneau]

I'm working on the next iteration of coxme.  (Rather slowly during the summer).
  
  This is the most subtle code I've done in S, both mathematically and 
technically, and seems a perfect vehicle for the "literate programming" paradym 
of Knuth.  The Sweave project is pointed at S output however, not source code.  
I would appreciate any pointers to an noweb type client that was R-aware.
  
  Other suggestions are welcome as well.  At the end of the day I'd like to have 
a good user guide, technical reference, and solid enough code documentation that 
others can begin to participate as well.  (Retirement in 10 years -- I don't 
expect to maintain this forever!)
  
  	Terry Therneau
  	therneau.terry at mayo.edu