I use R a lot. It's one of the primary tools I use in my day job as a scientist analyzing large datasets. If you use LaTeX with R (as I often do), you probably use Sweave to interleave R output and figures with your text describing those figures using the noweb method of literate programming.
You use it like the following:
[[!sweavealike echo=1 code=""" a <- 1 a <- a + 10 print(a) """]]
which produces this result when run:
> a <- 1 > a <- a + 10 > print(a)  11
You can also generate figures with it:
[[!sweavealike fig=1 echo=1 results="hide" code=""" plot(1:10,(1:10)^2,xlab="x",ylab=expression(x^2),main="Example Figure") """]] > plot(1:10,(1:10)^2,xlab="x",ylab=expression(x^2),main="Example Figure")
The plugin itself uses the neat Statistics::R perl module to handle all of the heavy lifting. I personally plan on using this plugin to help write some more entries in my learning R series of posts that I'm beginning to work on. Hopefully I'll find and fix most of the bugs as I embark on that process so anyone else who uses the plugin won't, but feel free to e-mail me if something isn't working as it should.
Finally, you shouldn't run this plugin on a publicly editable IkiWiki instance, because that would be a trivial local user exploit as R can run arbitrary code, read and write to arbitrary files, exhaust all memory, etc.