From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christian Moe <mail@christianmoe.com>
Subject: Babel/R: trouble with :units header arg
Date: Thu, 21 Apr 2011 21:38:55 +0200
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To: Org Mode <emacs-orgmode@gnu.org>

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