[R] preformatted and '#' in manual pages

[Duncan Murdoch]

Gábor Csárdi wrote:
> Dear All,
>
> I have the following in a .Rd file:
> ...
>       human readable (not binary) format. The format itself is like
>       the following:
>       \preformatted{
> 	\# vertex1name
> 	vertex2name [optionalWeight]
> 	vertex3name [optionalWeight]
>       }
>       Here, the first vertex of an edge is preceded with a pound sign
> ...
>
> and it is fine with R 2.9.2, but fails on R-devel, when building the
> PDF version of the manual:
> ...
> * checking PDF version of manual ... WARNING
> LaTeX errors when creating PDF version.
> This typically indicates Rd problems.
> LaTeX errors found:
> ! You can't use `macro parameter character #' in vertical mode.
> <argument> ...ike the following: \begin {alltt} ##
>                                                    vertex1name vertex2name [...
> l.9051 listed one per line on subsequent lines.}
>
> * checking PDF version of manual without index ... ERROR
>
> To be precise, this is
> * using R version 2.10.0 Under development (unstable) (2009-09-27 r49847)
>
> Is there a way to escape the '#' for LaTeX?

I believe the Latex macro you want is \sharp, which isnt an Rd macro, so 
you'd need something like
\latex{\sharp}{#}.

Duncan Murdoch