# [R] Tildes in R docmentation.

Prof Brian D Ripley ripley at stats.ox.ac.uk
Fri Sep 28 08:49:27 CEST 2001

This is widely used in the system help files. See e.g lm.Rd which has
\code{response ~ terms}.

That works in text, html and latex (how do you think we get a reference

\textasciitilde is a standard part of latex (in file latex.ltx).  The
feature was introduced in the 1995/12/01 release (see the usrguide.tex) so
it looks as if your latex is more than 5 years' old, or broken.

[...]

> However the Rd to latex processor seems to be converting the ~
> into ``\textasciitilde{}'' --- with a pair of braces on the end
> as if there should be an argument to the control sequence.  And
> then latex is unable to find that control sequence.

That's not what {} means.  It's an empty token to escape the following
space.  (la)tex does not use {} to introduce arguments.

> Can anyone explain to me what's going on, and how to go about
> solving the problem?

You do need a reasonably recent fully functional latex system.  Probably no
more than a couple of years' old (we don't have ancient installations
around to test).

[...]

--
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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