[OT] getting a ~ character in LaTeX - R-help

Tue, Jan 16, 2001 11:04 AM #

I am writing course notes in LaTeX.  In the part where I am describing
model-fitting functions in R I want to use a ~ character inline.  If I
am displaying an example of R code in its own environment I use the
alltt environment, which protects the ~ character.  I have forgotten
how to protect the ~ when I am writing something like
  The operator `~' is used to define a model formula in \R.
  The left hand side is evaluated as the response.  The right hand
  side can consist of several \Emph{terms} with special meanings

I welcome suggestions.
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Brian Ripley

Tue, Jan 16, 2001 11:55 AM #

On 16 Jan 2001, Douglas Bates wrote:

There is no really good simple idea. $sim$ is not too bad, \verb|~|
will give a raised tilde in most TeX fonts: you can also use
\textasciitilde (as used by Rdconv) in normal text.

V&R (well, R) made a virtual monospaced font taking ~ from a IBM
public version of Courier, scaled to fit, plus

\def\~{{\tt\char'176}}

which make \~ work as you might hope.

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)
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Stuart Luppescu

Tue, Jan 16, 2001 1:24 PM #

On 16-Jan-2001 Douglas Bates wrote:

How about \sim? That's what I use when I need a ~ meaning ``is distributed
as.'' You may need \usepackage{amsmath} with this, but I'm not sure.
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Peter Dalgaard

Tue, Jan 16, 2001 1:45 PM #

Douglas Bates <bates at stat.wisc.edu> writes:

I have at a similar spot:

As mentioned earlier, e.g.\ in connection with boxplots and
stripplots, the argument to |lm| is a \emph{model formula}, in which
the  tilde symbol (|~|) should be read as ``described by''.

(with \usepackage{shortvrb} and \MakeShortVerb| )

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Kurt Hornik

Tue, Jan 16, 2001 11:21 PM #

That is the most convenient solution, but in Doug's case there might be
a problem with typesetting

	foo ~ bar | baz

:-)

In the short run, I think the official solution is to use
	\textasciitilde
and if you look at the code for this you will see that
	latex.ltx:\DeclareTextCommandDefault{\textasciitilde}{\~{}}
	t1enc.def:\DeclareTextSymbol{\textasciitilde}{T1}{`\~}

In the long run, I realized when working on the newsletter style file
with Fritz that if we have texinfo/HTML like markup commands such as
\code and \file then *inside* these we really want a behavior similar to
alltt or inside \url, i.e., only the escape and the grouping chars
should be special (only `\' `{' and `}').  I am planning to write macros
for this, maybe in a style file of its own so that we can also use it in
Rd.sty, for example.

-k
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