Dear list, Inspired by the original Knuth tools, and for paedaogical reasons, I wish to produce a document presenting some source code with interspersed comments in the source (see Knuth's books rendering TeX and metafont sources to see what I mean).
I seemed to remember that a code chunk could be defined piecewise, like in Comments... <<Chunk1, eval=FALSE, echo=TRUE>>= SomeCode @ Some other comments... <<Chunk2, eval=FALSE, echo=TRUE>>= MoreCode @ And finally, <<Chunk3, eval=TRUE, echo=TRUE>>= <<Chunk1>> <<Chunk2>> EndOfTheCode @ That works ... as long as SomeCode, MoreCode and EndOfTheCode are self- standing pieces of R code, but *not* code fragments. You can *not* intersperse comments in, say, a function body, or local() environment this way : when Sweaving, *R* complains of an incomplete source (makes noise about an unexpected end of input at the end of Chunk1, IIRC, and never sees Chunk2). I hoped that Sweave's "alternative" syntax could offer a way out : no such luck. There seems to be no way to delay R evaluation of a R chunk passed by Sweave ; at least, the "eval=FALSE" option of chunk declaration is not sufficient for that. Am I missing something in the Sweave nd odfWeve documentations (that I read till I grew green and moldy) ? Or does this require a fundamental change in the relevant Sweave drivers ? Can you suggest alternative ways of doing what I mean to do ? The only workaround I found is to paste a second copy of my code in a \verbatim environment (or, in the case of odfWeave, in the "text" part), and spice it with \end{verbatim} comments.. \begin{verbatim} chunks. This way, I lose any guarantee of consistency between commented text and effective code. Any other idea ? Emmanuel Charpentier ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.