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...(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 f...