Getting Ultra-Tex and Noweb Modes to Play Together

This isn't so difficult, once the realization is made that there are special functions for setting various variables within the noweb-mode. Here is the chunk of code that I added to my .emacs file (or rather to my site-init.el file:

(defun Rnw-mode ()
  (interactive)
  (require 'ess-noweb)  
  (noweb-mode)
  (noweb-set-doc-mode 'ultra-tex-mode)
  (if (fboundp 'R-mode) 
      (setq noweb-set-code-mode 'R-mode)))

It is somewhat different than the code given at the Sweave site, but it works w/o errors about a missing latex.el file.