Re: Org babel R Help

[Dan Davison <davison@stats.ox.ac.uk>]

Joseph Cole <coljo582@student.otago.ac.nz> writes:

> I've been struggling with a few aspects of org babel R:
>
> 1) src_R surrounds output with ==.
>
> E.g. src_R{1+1} gives =2=
>
> I would expect it to just give 2. Because it surrounds the output with
> equals signs, this means you are unable to use the output in latex
> equations, general text or tables as it's ugly.

Hi Joseph,

If you use ':results raw', then the results will be inserted without the
surrounding '='. You will need to pull the latest git head as I just
fixed a bug regarding that. So you could use

src_R[:results raw]{1+1}

but to make it less clumsy you could configure
org-babel-default-inline-header-args, e.g.

(setq org-babel-default-inline-header-args
      (org-babel-merge-params org-babel-default-inline-header-args '((:results . "raw"))))

after which 

\begin{equation}
1 + src_R{1+1} = 3
\end{equation}

exports to latex as

\begin{equation}
1 + 2 = 3
\end{equation}

As for the default behaviour, the == declares that the contents should
be formatted fixed-width on export. Normally in latex export that
results in \texttt{}, but I see that inside a begin_equation the ==
remain. I wonder whether that could be argued to be an org-mode latex
exporter bug?

>
> Where should I start looking to fix this? I'm a lisp novice but happy
> to learn.

org-babel-exp.el

>
> 2) Width/Height exports for R graphics output. Do they work?
>
> I've tried a lot of combinations of :width and :height as exports, and
> they don't seem to work at all. I've tried small numbers (1-10), large
> numbers (100-2000) and numbers prefixed by "cm" with no luck.

Hmm, I'm not seeing a problem here. It works for me with both png and
pdf output. E.g.

#+begin_src R :file z.pdf :width 20 :height 40 :exports both
plot(1:10)
#+end_src

What image format (i.e. R graphics device) are you using?  Can you post
an example block that is not working? The values for :width and :height
will be passed straight on to the graphics device, so their meaning
depends on which graphics device is being used in R.

>
> I know I can use #+attr_latex: width=15cm.
>
> 3) R-graphics quality
>
> I can't seem to find any examples of how to set the R graphics output
> quality, and nothing I try seems to alter the result (using :quality).

I'm not sure what you mean by "R graphics output quality". The section
"Graphical output" in

http://orgmode.org/worg/org-contrib/babel/languages/org-babel-doc-R.php

describes how to pass arguments to the R graphics devices. In addition
to the ones that org-babel knows about like :width, you can pass
arbitrary extra arguments to the R device using :R-dev-args.

>
> Are there any publication quality r-graphics examples I could take a
> look at, as I've been unable to find any on google.

You mean using org-babel or just using R?

Hope that helps.

Dan


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