On Wed, 2003-09-24 at 03:06, Millo Giovanni wrote:
> Dear all,
>
> I was wondering whether there is a way to make loops in Sweave, i.e. for example to:
> 1) calculate a parameter, say, a=length(b)
> 2) according to that, add #a# chapters to the document, each including some
> repetitive analysis, each time done on a particular subset of the data indexed by
> the elements of 1:a.
> This would be of great help for repeating exploratory data analyses on, say,
> questionaries when the number of questions changes without having to change the
> Sweave .snw file.
Two possible ways, off the top of my head:
1) Within LaTeX, use \Sexpr{a} to get the length, then loop within
LaTeX. I believe Lamport includes an example of looping within LaTeX,
but I haven't got the book handy.
2) Within the R chunk, generate the table using xtable() (package
"xtable") or Latex (package "Hmisc") and print directly within R. I
haven't tried it, but something like
<<echo=FALSE,results=tex>>=
## build your table in R
tt <- xtable(foo)
print(tt)
@
might do the trick. I'd been meaning to look at this anyway; you
question prompted me ;)
Check the Sweave manual at Herr Dr Leisch's site.
http://www.ci.tuwein.ac.at/~leisch/Sweave
This has the R chunk options required to produce the above, if my
untested example is not correct.
Cheers
Jason
--
Indigo Industrial Controls Ltd.
http://www.indigoindustrial.co.nz
+64-(0)21-343-545
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