Converting R to Sweave (Rnw)

On 3/2/2009 9:06 AM, Rainer M Krug wrote:

Hi

I am thinking about using Sweave more frequently, especially for
documenting code. But the syntax is slightly awkward for me (<<name>>=
... @), and I was thinking if there would be a way of importing the
type of code extracted from an Rnw file back into an Rnw file? The
advantage would be that the code could run in R without tangling.
Obviously, sweave options could not be imported, but that would be
fine for me. Below an example of the code generated by Rtangle, which
I would like to import into a sweave file.

I don't think so, but writing a new driver is only a medium difficulty 
job.  Start with an existing one in

https://svn.r-project.org/R/trunk/src/library/utils/R/Sweave.R

and modify until you have what you want. The harder part of this is the 
design:  exactly what input and output is not going to be awkward?

A different approach to the same problem is to use specially formatted 
comments in the R source to generate documentation; I think the R.oo 
package includes such a thing, and there may be others.  I haven't used 
these with R, but have in other languages, and they were nice there.

Duncan Murdoch

Cheers

Rainer

###################################################
### chunk number 1: a
###################################################
x <- 10



###################################################
### chunk number 2:
###################################################
asequence<- seq(from=0,to=5,by=0.1)
expnegx2 <- exp(-asequence^2)

plot(asequence,expnegx2,type="l",ylab=expression(exp(-z^2)),xlab="z")


###################################################
### chunk number 3: Normal1
###################################################
mu <- 3
sigma <- 5

--
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
Biology, UCT), Dipl. Phys. (Germany)

Centre of Excellence for Invasion Biology
Faculty of Science
Natural Sciences Building
Private Bag X1
University of Stellenbosch
Matieland 7602
South Africa