Sweave: How to get blank lines as in the source? - sweave

Question

How can I get a blank line before the second comment in the PDF file of the following .Rnw file? I tried to work with keep.source and strip.white, but I still don't get the blank line -- all the chunks are "pasted" together.
\documentclass{article}
\usepackage{fancyvrb}
\usepackage{Sweave}
\begin{document}
<<setup, eval=FALSE>>=
## some comment
a <- 1
b <- 2
## some comment (there is no newline before this comment...)
c <- 3
d <- 4
#
\end{document}

Answer 1

I wouldn't know about any option for keeping the blank line. What you could do:
(1) If you need the named chunk kept together, you could simply put a # at the beginning of the supposedly blank line:
<<setup, eval=FALSE>>=
## some comment
a <- 1
b <- 2
#
## some comment (there is no newline before this comment...)
c <- 3
d <- 4
#
Less attractive, but you have at least something similar to a blank line, and keep your chunk.
(2) If you don't care for keeping the chunk together, you can separate it into two blocks:
\documentclass{article}
\usepackage{fancyvrb}
\usepackage{Sweave}
\begin{document}
<<setup, eval=FALSE>>=
## some comment
a <- 1
b <- 2
#
<<eval=FALSE>>=
## some comment (there is no newline before this comment...)
c <- 3
d <- 4
#
\end{document}
This gives you the appearance you like, at the price of losing the structure of your chunk.
Hope this helps,
Rainer