[R] Sweave and echoing R comments

Friedrich.Leisch@ci.tuwien.ac.at Friedrich.Leisch at ci.tuwien.ac.at
Mon Jun 21 09:28:17 CEST 2004

>>>>> On Sun, 20 Jun 2004 20:34:50 +0000,
>>>>> Frank E Harrell (FEH) wrote:

  > Charles H. Franklin wrote:
  >> Is there any way to echo comments from an R source file into an 
  SWeave-> LaTeX document?
  >> Example:
  >> # Npop is population total
  >> # Npoph0..Npoph2 are stratum totals
  >> # Npoph is vector of stratum totals
  >> Npop<-sum(to2000)
  >> Npoph0<-sum(to2000[bg==0])
  >> Npoph1<-sum(to2000[bg==1])
  >> Npoph2<-sum(to2000[bg==2])
  >> Npoph<-c(Npoph0,Npoph1,Npoph2)
  >> In the final LaTeX document, I'd like the comments to be echoed so 
  >> readers other than me have guidance about variable names etc.
  >> I suppose advocates of literate programming might argue that if the 
  >> comment is important it should be in the body of the .snw file, not 
  >> merely as R comments. Still... it seems easier to use brief comments in 
  >> the code itself and more explanatory text in the body of the document.
  >> Searches of "Sweave" and "comment" in the list and documentation didn't 
  >> turn up anything about echoing comments in either R or Sweave.
  >> Thanks.
  >> Charles

  > I agree that it would be nice to see comments in the output.  I hope 
  > that Fritz Leisch will consider adding a hook that is a user-provided R 
  > function that take vectors of character strings representing a chunk of 
  > code and generating any desired LaTeX markup for pretty printing of the 
  > code.  The function would return character vectors in LaTeX format.  I 
  > like comments to appear in a smaller font, and for certain character 
  > translations, such as <- being replaced with a left arrow.

I agree that it would be nice, and it is on my list of things I want
to do over the summer ...


                        Friedrich Leisch 
Institut für Statistik                     Tel: (+43 1) 58801 10715
Technische Universität Wien                Fax: (+43 1) 58801 10798
Wiedner Hauptstraße 8-10/1071
A-1040 Wien, Austria             http://www.ci.tuwien.ac.at/~leisch

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