[O] Babel/R: trouble with :units header arg

[Christian Moe]

Hi,

Some Babel/R plots that worked a couple of months ago gave an error 
message on the :units header arg when I tried to run them again now. 
There could be many reasons (including a computer upgrade in the 
meantime), but in case it's an Org thing, a minimal example follows 
below (parabola plot for 8x8cm paper output). I'd appreciate any tips.


#+begin_src R  :results graphics :file test.png :width 8 :height 8 
:res 200 :units "cm"
  x <- -10:10
  y <- x^2
  plot(x, y, type="l", col="red", lty=1)
#+end_src

Documentation indicates this should work, but I get:

 Error in match.arg(units, c("in", "px", "cm", "mm")) :
   'arg' must be NULL or a character vector
 Calls: <Anonymous> -> <Anonymous> -> png -> match.arg
 Execution halted

Same if I use single quotes or no quotes around "cm".

Replacing ~:units "cm"~ with ~:R-dev-args units="cm"~ works:

#+begin_src R  :results graphics :file test.png :width 8 :height 8 
:res 200 :R-dev-args units="cm"
  x <- -10:10
  y <- x^2
  plot(x, y, type="l", col="red", lty=1)
#+end_src

#+results:
[[file:test.png]]


Yours,
Christian