knitr doesn't convert xtable output on R 3.0.2 - r

Question

I would like to create a tex table using xtable(). Here's my minimal example which worked when I used the same R version on Win 7.
\documentclass[a4paper,12pt,twoside]{article}
\begin{document}
<<load-packages,include=TRUE,echo=TRUE>>=
library(xtable)
#
<<testing-xtable,echo=TRUE,cache=FALSE,include=TRUE>>=
tab <- matrix(1:50,nrow=10)
rownames(tab) <- letters[1:10]
print(
xtable(
x=tab,
caption="A table",
label="tab",
align=rep("c",times=6),
digits=3,
display=rep("f",times=6)
),
sanitize.colnames.function=identity,
include.rownames=FALSE,
table.placement="h"
)
#
\end{document}
Instead of a nice table I get the verbatim code output of xlatex() in the pdf document.
Here's the output of knitr:
> grDevices::pdf.options(useDingbats = FALSE); require(knitr); opts_knit$set(concordance = TRUE); knit('xtable.Rnw', encoding='UTF-8')
Loading required package: knitr
processing file: xtable.Rnw
|............. | 20%
ordinary text without R code
|.......................... | 40%
label: load-packages (with options)
List of 2
$ include: logi TRUE
$ echo : logi TRUE
|....................................... | 60%
ordinary text without R code
|.................................................... | 80%
label: testing-xtable (with options)
List of 3
$ echo : logi TRUE
$ cache : logi FALSE
$ include: logi TRUE
|.................................................................| 100%
ordinary text without R code
output file: xtable.tex
[1] "xtable.tex"
>
>
Running pdflatex on xtable.tex...completed
Created PDF: ~/Dropbox/intern/sandbox(coding)/tex/chapter/chapter/sandbox/xtable/xtable.pdf
Issues: 2 badboxes
The code chunk testing-xtable should be echoed in the final document but it isn't. This is the pdf output. I'm suspicious about the message Ordinary text without R code. Is this normal?
Any help would be greatly appreciated.

Answer 1

Use the chunk option results='asis'.