[R] Sweave with pdf(): how to remove mention "null device"

[Matthieu Stigler]

great, solved! Thanks a lot for your quick help!

Le 27. 01. 11 11:22, Prof Brian Ripley a écrit :
> 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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>>
>