On Mon, Jun 07, 2010 at 10:03:46AM +0100, Dan Davison wrote:
> Hi Russell,
>
> Thanks, that's clear. You may well be right that it would be appropriate
> to expose further information about the babel source block
> (e.g. the :file argument) to the external language. However, one general
> design consideration is that where possible we do want to avoid
> implementing ad-hoc language-specific behaviour. If we do go your route
> I would suggest that everything should be wrapped up in a single list
> object (hash in perl, dict in python, etc etc), and that that list/hash
> object should have a reasonably consistent name across languages
> (__org_babel_header_args__ or something).
I already thought of that, but R was my target here. I didn't want to
jump into a major design decision. ;]
> For now however, I would suggest taking the view that what you are doing
> is slightly non-standard org-babel usage, and therefore that it should
> be achieved more explicitly. E.g. how about the following approach?
>
> #+begin_src R :results file :var basename="myplot"
> a <- 1:4
> pngfile <- sprintf("%s.png", basename)
> pdffile <- sprintf("%s.pdf", basename)
>
> png(pngfile)
> plot(a)
> dev.off()
>
> pdf(pdffile)
> plot(a)
> dev.off()
>
> pngfile
> #+end_src
I like this better, and I can use dev.copy here too. The issue is a
plot is rarely one line. Most of my plots are a half page of code
between the data set, legend, etc.
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