shrink knitr output to multiple columns

Question

I am providing a very simple example here. In my dataset, I have 50+ names in column. I get annoyed by the fact that colnames() output takes 50+ lines too! Is it possible to divide the output over multiple columns? Just by using some simple parameters to add to chunk. So my pdf documents are shorter.

\documentclass{article}

\begin{document}
<<>>=
library(ggplot2)
colnames(diamonds)
@
\end{document}

Sample Output

"carat"
"cut"
"color"
"clarity"
"depth"
"table"
"price"
"x"
"y"
"z" 

Answer 1

While this question would get a better answer in https://stackoverflow.com/questions/tagged/r However, try this for a vertical list

\documentclass{article}
\begin{document}
<<>>=
cat(colnames(mtcars),sep="\n")
@
\end{document}

I am still considering how to eliminate the pesky ##s

Answer 2

Upon the answer of R. Schumacher, if you show the ouput of the chunk 'asis' (as LaTeX text) you can use the LaTeX \\ as separator, and format the ouput in a 'multicols environment. This way there are no pesky ##s ;)

\documentclass{article}
\usepackage[paperheight=6cm,paperwidth=8cm,margin=1cm]{geometry}
\pagestyle{empty}
\usepackage{multicol}
\begin{document}
<<results='hide'>>=
cat(colnames(mtcars),sep="\\\\")
@
\setlength{\columnsep}{1cm}
\setlength\columnseprule{.4pt}
\begin{multicols}{3}
\noindent
<<echo=F,results='asis'>>=
cat(colnames(mtcars),sep="\\\\")
@
\end{multicols}
\end{document}