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

[Antonio, Fabio Di Narzo]

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.

Antonio.

> So ignoring LaTeX comment lines would solve two problems.
>
> Best,
>
> + seth
>
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