[R] Sweave does not respect width

From: Enrico Rossi <enrico.a.rossi_at_gmail.com>
Date: Mon, 26 May 2008 15:15:39 -0400

Hello,

I'm learning to use Sweave, and I've run into a problem: sometimes, when entering long lines of input and using long variable names, Sweave will not insert linebreaks in a way that respects the width setting. This causes undesirable overflows into the margins in the latex file. For example, consider the following document (adapted from the GLM example):

\documentclass{article}
\begin{document}

<<setup,include=FALSE,echo=FALSE>>=
options(width=80)
@

<<test>>=
countsasdfasdfasdf <- c(18,17,15,20,10,20,25,13,12) outcomeasdfasdfasdf <- gl(3,1,9)
treatmentasdfasdfasdfasdf <- gl(3,3)
glm.D93 <- glm(countsasdfasdfasdf ~ outcomeasdfasdfasdf + treatmentasdfasdfasdfasdf, family=poisson()) @

\end{document}

When I compile this, treatmentasdfasdfasdfasdf sticks out into the right margin. The linebreak is inserted after the last comma, so that the line as printed is 85 characters long, even though I set width to 80 at the top. Ideally, Sweave would set the linebreak after the last plus symbol.

There is a simple workaround that I have been using: if a line causes problems, set width to something smaller before the line, and set it back afterwards. It's pretty clumsy though, and I wonder if there is a better way. My understanding is that there is no way to manually set linebreaks, what a pity!

I am using R 2.6.2 and the MacTex 2007 distribution. If this problem has been fixed in a recent version, I apologize.

Cheers,
Enrico

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