# [Rd] Bug in Sweave? -- scoping problem? (PR#8615)

From: <murdoch_at_stats.uwo.ca>
Date: Sat 18 Feb 2006 - 19:41:37 GMT

I have found a strange scoping problem in Sweave. The following Rnw file doesn't produce the same output in Sweave as it does if I produce an R file using Stangle and execute that:

\documentclass[12pt]{article}
\begin{document}

<<R>>=
election <- data.frame(A=1:3, B=9:7, C=rep(0,3)) partytotal <- rep(0, ncol(election))
for (i in 1:ncol(election)) {

partytotal[i] <- sum(election[,i], na.rm=TRUE) }
@

<<fig=true,width=12,height=6,echo=true>>= names(partytotal) <- names(election)
partytotal <- sort(partytotal)
partytotal
dotchart(partytotal)
@
\end{document}

The data.frame "election" contains columns which are vote counts for 3 parties, with rows being 3 electoral districts. The column totals are 6 for A, 24 for B, and 0 for C. I calculate those totals in a vector partytotal, assign the names to its entries, and then sort it.

The strange thing is that while the value in partytotal is output correctly as

\begin{Sinput}

  > names(partytotal) <- names(election)
> partytotal <- sort(partytotal)
> partytotal


\end{Sinput}
\begin{Soutput}

C A B
0 6 24
\end{Soutput}
\begin{Sinput}

> dotchart(partytotal)
\end{Sinput}

but the dotchart contains the wrong values: it shows sorted values, but not sorted names, which is also what is left over in my workspace after the Sweave call:

> partytotal
A B C
0 6 24

These tests were run in R 2.2.1, but I see the same thing in today's R-devel.

Duncan Murdoch

R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel Received on Sun Feb 19 06:44:04 2006

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