Note that the 'problem' is with dev.off(), not pdf(), and the answer
is ?invisible.
pdf()
invisible(dev.off())
On Thu, 27 Jan 2011, Matthieu Stigler wrote:
Hi
I am sorry, my question seems simple and must already have been asked, but I
did not find any aswser on the archives :-(
Searching for the irrelevant 'pdf()' will not have helped, I fear ...
I am trying to use a plot in Sweave, where I include myself the statement
<<results=tex,echo=FALSE>>=
pdf("plot.pdf")
plot(runif(100))
dev.off()
cat("\\includegraphics{plot}\n\n")
@
as is documented in the Sweave user guide A.9. The problem is that a "null
device 0" is printed in my document! Indeed, each time one opens pdf() or any
device, some mention "pdf" inevitably shows up... try:
pdf()
plot(runif())
dev.off()
How can one get rid of this? The only workaround I found is to place it into
a if() loop:
for(i in 1:1){
pdf()
plot(runif())
dev.off()
}
so there is no track of the mention null device, and my sweave pdf looks
better. Any idea of a more elegant solution?
Thanks!!
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--
Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
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