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!!