#+name: input
| 1 | 2 |
| 2 | 4 |
| 3 | 9 |

#+NAME: pvals_waw
#+headers: :var input=input
#+BEGIN_SRC R :results graphics :file output.pdf
plot(input)
#+END_SRC

after evaluating the code block I get

#+RESULTS: pvals_waw
[[file:output.pdf]]