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

[Antonio, Fabio Di Narzo]

Hi.

2006/9/20, Marc Schwartz <MSchwartz a mn.rr.com>:
> Hi all,
>
> On FC5, using:
>
>   Version 2.3.1 Patched (2006-08-06 r38829)
>
> and today's
>
>   R version 2.4.0 alpha (2006-09-19 r39397)
>
> with the following .Rnw file:
>
>
> \documentclass[10pt]{article}
> \begin{document}
>
>    This line should print '2': \Sexpr{1 + 1}
> %% This line should NOT print '2': \Sexpr{1 + 1}

If it's just a comment, why don't use something like:
% \ Sexpr (del the space)
or
%\sexpr (change 'sexpr' with 'Sexpr')
or
%...the 'Sexpr' command (add a backslash in latex code)
?

Antonio.

>
> \end{document}
>
>
> The \Sexpr in the second line is processed even though the line is
> commented. This results in the following .tex file content (in the case
> of R 2.4.0):
>
>
> \documentclass[10pt]{article}
> \usepackage{/home/marcs/R.Files/SourceCode/R-alpha/share/texmf/Sweave}
> \begin{document}
>
>    This line should print '2': 2
> %% This line should NOT print '2': 2
>
> \end{document}
>
>
>
> Shouldn't Sweave just generally ignore commented LaTeX code? In
> reviewing Sweave.R I did not see a check for this, so perhaps there are
> circumstances where one wants a \Sexpr in commented LaTeX code
> processed. An example escapes me at the moment however.
>
> HTH,
>
> Marc Schwartz
>
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