[Rd] Sweave processes \Sexpr in commented LaTeX source (2.3.1patched and 2.4.0)

Seth Falcon sfalcon at fhcrc.org
Wed Sep 20 19:07:26 CEST 2006

"Antonio, Fabio Di Narzo" <antonio.fabio at gmail.com> writes:

> 2006/9/20, Seth Falcon <sfalcon at fhcrc.org>:
>> Peter Dalgaard <p.dalgaard at biostat.ku.dk> writes:
>> > ..not to mention TeX comments inside Sexpr (e.g. %*%...). Skipping
>> > lines with % as the first character might be a viable compromise
>> > though.
>> +1.  You could probably ignore any lines where the first
>> non-whitespace char is '%'.  But if that seems to risky, then only
>> recognizing first-char-is-% seems a worthwhile heuristic.
>> Another place where this has bitten people is when they do:
>> %\usepackage{Sweave}
>> Sweave picks that up and doesn't insert the usepackage line itself.
> I've found that extremely useful for sweaving Stex files which aren't
> "master" files (i.e., only files to include in a main latex file).
> Inserting '\usepackage{Sweave}' in each would result in a latex error.
> So commenting it out is a useful workaround.

Commenting it out _and_ having Sweave see it?

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