knitr and comments

[jamiefolson]

I would like to reopen the issue regarding knitr and comments. I don't quite understand either the technical or semantic/syntactic arguments against obeying latex comments: "%". I successfully modified knitr to obey source comments so that inside knitr commands, they're ignored, but outside knitr commands they're respected. I'd be happy to provide a patch for anyone to look over. I only wrote the regexp for latex comments, but it'd be easy (as long as you can describe comments with a regex) to extend it to any other source type.

I would see the reasoning against it except that \Sexpr{} and \SweaveOpts{} appear as if they were latex commands and it seems to me as if the expected thing is for them to obey comments.

[yihui]

this feature is not there mainly because of implementation difficulties (as mentioned in #110), so if you have already succeeded in letting knitr obey LaTeX comments, I will be glad to accept the patch

[yihui]

this has been done in #110, so I'm closing it

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