Sweave() within a function: objects not found
On 11/11/2009 12:09 PM, Pfaff, Bernhard Dr. wrote:
Dear list subscriber,
suppose, I do have a minimal Sweave file 'test.Rnw':
\documentclass{article}
\begin{document}
<<printx>>=
x
@
\end{document}
Within R, I define the following function:
f <- function(x){
Sweave("test.Rnw")
}
The call:
f(x = 1:10)
results in the following error message:
f(x = 1:10)
Writing to file test.tex Processing code chunks ... 1 : echo term verbatim (label=printx) Error: chunk 1 (label=printx) Error in eval(expr, envir, enclos) : object 'x' not found In principle, I could assign x to the global environment and then the Sweave file will be processed correctly:
f2 <- function(x){
+ attach(list(x = x))
+ Sweave("test.Rnw")
+ }
f2(x = 1:10)
Writing to file test.tex Processing code chunks ... 1 : echo term verbatim (label=printx) You can now run LaTeX on 'test.tex'
Kind of a dum question, but how could it be achieved that Sweave recognizes the objects within this function call?
The way you did it is close. You can attach all the local variables by using attach(environment()) though global variables will take precedence, because attach puts the environment 2nd in the search list. And you'd better remember to detach them. I'd say it's better to make Sweave files self-contained, so that you can run R CMD Sweave outside of R, and get the right results. But if you really want to do this, then you can write your own Sweave driver and replace the default RweaveEvalWithOpt with a function that looks elsewhere for variables. Duncan Murdoch
Any pointers are most welcome, Bernhard
sessionInfo()
R version 2.10.0 (2009-10-26) i386-pc-mingw32 locale: [1] LC_COLLATE=German_Germany.1252 LC_CTYPE=German_Germany.1252 [3] LC_MONETARY=German_Germany.1252 LC_NUMERIC=C [5] LC_TIME=German_Germany.1252 attached base packages: [1] stats graphics datasets utils grDevices methods base other attached packages: [1] fortunes_1.3-6
Dr. Bernhard Pfaff
Director
Global Quantitative Equity
Invesco Asset Management Deutschland GmbH
An der Welle 5
D-60322 Frankfurt am Main
Tel: +49 (0)69 29807 230
Fax: +49 (0)69 29807 178
www.institutional.invesco.com
Email: bernhard_pfaff at fra.invesco.com
Gesch?ftsf?hrer: Karl Georg Bayer, Bernhard Langer, Dr. Jens Langewand, Alexander Lehmann, Christian Puschmann
Handelsregister: Frankfurt am Main, HRB 28469
Sitz der Gesellschaft: Frankfurt am Main
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