** caching on export
   :PROPERTIES:
   :DATE:     2011-03-23
   :END:
#+name: testcache
#+begin_src R :cache yes :exports results
  dat <-  matrix(runif(12), 3, 4)
  print(dat)
#+end_src

#+name[e7b83e61596da84f85c5a24e61569576c802f9a2]: testcache
| 0.590091332094744 | 0.101750465808436 | 0.487125408137217 |  0.92315583024174 |
| 0.483292032498866 | 0.427640072302893 | 0.974636133294553 | 0.995571716455743 |
|  0.60190233332105 | 0.122638279106468 | 0.437959408387542 | 0.015639441087842 |