[R] Sweave: Changing the background color, adding a border

[Christophe Genolini]

Hi all,

I am using Sweave to produce a document. Unfortunately, I have to print 
several copies and I can't print them in color. So I would like to 
change the way of printing the code. I would like to print the code in a 
box with a black borderline and a grey background (quite classic). Is it 
possible to do it by changing some Schunk options?

Christophe