Is there a way to colorize comments/code in Sweave?

Question

I found that I can keep comments in the Sweave code chunks by specifying keep.source in the \SweaveOpts, but is there a way to make the code listing look nice like with grayed out comments?

Answer 1

There are several options illustrated at Vanderbilt University's Department of Biostatistics sweave templates site: http://biostat.mc.vanderbilt.edu/wiki/Main/SweaveTemplate

I found the Sweavel style to be the most flexible.

The highlight package is another option.

Answer 2

the pgfSweave package can produce syntax-highlighted code.