[R] Sweave question

Ralf B ralf.bierig at gmail.com
Sun Nov 14 04:31:54 CET 2010

Thank you. The article you cited explains on the last page how this is
done and shows how Sweave is run from within R and it says that it
creates the .tex file.

My last remaining question is now if there is a way to execute this
Sweave tex output by executing Latex from R. In other words, what is
the command to execute latex from within R. Or do I perhaps think to
complcated and there is a single command to create the tex and the
pdf/ps in a single step? At the end, I would like to create everything
between the Sweave document and the final pdf/ps output from within R
without the need to make external calls.


On Sat, Nov 13, 2010 at 4:29 PM, Johannes Huesing <johannes at huesing.name> wrote:
> Ralf B <ralf.bierig at gmail.com> [Sat, Nov 13, 2010 at 10:03:49PM CET]:
>> It seems that Sweave is supposed to be used from Latex and R is called
>> during the LaTeX compilation process whenever R chunks appear.
> This is not how it works.
> In the first page of
> http://www.statistik.lmu.de/~leisch/Sweave/Sweave-Rnews-2002-3.pdf
> that the file is first processed by R before it can be typeset by
> LaTeX.
>> What
>> about the other way round? I would like to run it triggered by R. Is
>> this possible?
> To my understanding this is how it's done.
>> I understand that this does not correspond to the idea
>> of literate programming since it means that there is R code running
>> outside the document,
> You lost me here.
>> but for my practical approach, I would like to
>> use Sweave more like a report extension at the end of my already
>> existing R scripts that combined a number of diagrams to a pdf file.
>> My second question is, does Sweave create a potential performance
>> bottleneck when used with very big data analysis compared with when
>> using R directly?
> Not really, because the only overhead is tangling the Sweave file.
> If it is very big, you may want to process only the parts you have
> changed last. The package weaver seems to come in handy then, see
> http://bioconductor.org/packages/2.6/bioc/vignettes/weaver/inst/doc/weaver_howTo.pdf
> --
> Johannes Hüsing               There is something fascinating about science.
>                              One gets such wholesale returns of conjecture
> mailto:johannes at huesing.name  from such a trifling investment of fact.
> http://derwisch.wikidot.com         (Mark Twain, "Life on the Mississippi")
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