Re: Re: org-babel-R export parameters

[Russell Adams <RLAdams@AdamsInfoServ.Com>]

On Mon, Jun 07, 2010 at 12:27:46AM +0100, Dan Davison wrote:
> Russell Adams <RLAdams@AdamsInfoServ.Com> writes:
> 
> > I needed the ability to view what parameters were sent to plot in
> > R. Turns out that you can't query some things like the active filename
> > in R, so I went back to org.

Really, you can't query the filename of the active device in R. I
exported all the parameters to the R code block to R variables so I
can use them in R.

> > This patch takes each parameter and converts it to a variable in R,
> > including the filename (org_babel_filename).
> >
> > My intent is to parse the filename in R to create a dev.copy() to a
> > pdf while creating a PNG. Ideally then I can see the png inline, and
> > export to latex with the PDF.

See example.

> 
> Hi Russell,
> 
> I haven't completely understood paras 1 and 3 above. Would you mind
> posting an example that illustrates the problem that this patch solves?
> 
> Dan
> 

Here's a non-functional example that I hope can illustrate the point:

----------------------------------------------------------------------
* HEading

  blah blah blah blah blah blah blah blah blah blah blah blah blah


#+BEGIN_SRC R :file whatever.png :width 300 :height 200 :exports none

a = c(1,2,3,4)
plot(a)

dev.copy(pdf,gsub(".png",".pdf",org_babel_filename))
#+END_SRC

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

#+LATEX \\include[whatever.pdf]

----------------------------------------------------------------------

The idea is I want to be able to see the inline PNG image of my graph
while writing, and when I export I'll point the latex exporter to the
PDF. This provides a vector format for Latex, instead of a low
resolution bitmap. Yes you can use PDF's as includes, and they look
great because they are a vector format.

Does that help?

I'm having issues with the R dev.copy, but that's a separate issue.

Thanks.

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Russell Adams                            RLAdams@AdamsInfoServ.com

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