The discussion on Rnw mode prompts me to ask:
 
1.  Is there a neat way to avoid processing (through Sweave in R) all of a .Rnw file?
 
I sometimes would like to make a change at the beginning and get a quick turn-round without having to wait for all of the subsequent results of the remaining code chunks.  I have tried inserting "\end{document}" but that is ignored by Sweave as far as I can see.  Since R and LaTeX need different comment styles, it's not so easy to comment out sections of code and documentation simultaneously.   It is possible to make a second smaller document, sure, and I have done that.  The problem with that is then one of version control (of the R workspace): it was trying to avoid these problems that made me start using noweb (which is brilliant - thank you , thank you, thank you!).  What might be nice would be conditional execution of chunks (or - can't believe I am about to write this - a GO TO chunk-label)?  
 
2.  If I turn on flyspell in .Rnw file editing, it picks up repeated words in code chunks:
date3 <- AllPipData.tidy1$GDW.Discharge.Close.Date
date3[1:10]
even though there is a new line.  (The "date" in "date3[1:10]" is marked.)  However nothing appears in the minibuffer window and I get clicking on the highlighted text has no (useful) effect.  What is more irritating is that the doc/code distinction is removed after this happens.  By that I mean that doc chunks are not recognised as such so the menus and font-locks for new text in the doc chunks are not available.  Closing and re-opening and not turning on flyspell fixes it, but it is an annoying little glitch.  
 
I am using ESS version 5.2.10, with GNU Emacs 21.3.1 (i386-mingw-nt5.0.2195) of 2004-03-11 on NYAUMO.
 
Many thanks for your help.
 
Alun
 
---------------------
Dr Alun Pope
 
Group Credit
St.George Bank
Level 9
182 George St
Sydney NSW 2000
 
(T): 02 9236 1442
(F): 02 9236 1570



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