On 09/12/2010 2:07 PM, Arnau Mir Torres wrote:
Hello.
I need that Sweave writes R output to a file. To do it, I put the following
into the foo.Rnw file:
\documentclass{article}
\usepackage{Sweave}
\begin{document}
...
<<echo=F>>=
x<- rnorm(100)
y<- rnorm(100)
sink("foo.txt")
summary(lm(y~x))
sink()
@
...
\end{document}
When I run:
R CMD Sweave foo.Rnw
R responses:
Warning message:
In sink() : no sink to remove,
and It doesn't work. Somebody knows how I can fix it?
The problem is that Sweave executes each statement wrapped within sink(
con ); statement; sink(). You need to avoid using sink() as a separate
statement. One way would be to put the lines
sink("foo.txt")
summary(lm(y~x))
sink()
into a block using braces {}; Sweave would wrap the whole function call, not
the individual lines. That's essentially what
capture.output() does, so this should work:
writeLines( capture.output( summary(lm(y~x)) ), "foo.txt")
You can probably do it in other ways too.
Duncan Murdoch
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