** tangle R and load
   :PROPERTIES:
   :tangle:   with-comments.r
   :comments: yes
   :DATE:     2010-07-09
   :END:

#+begin_src R :tangle no
  z <- 0
#+end_src

#+begin_src R
  x <- 8
#+end_src

#+begin_src R
  y <- 9
#+end_src

#+name: i-have-a-name
#+begin_src R 
  x+y+z
#+end_src