R devel - Dec 2003 - Using \leq for <= in Rd files

Hi,

When writing formulae in Rd files I use \leq to get a less-than-or-equal-to
sign, as this is what the LaTeX references I consulted suggested. This works
correctly for the PDF output (Rcmd Rd2dvi.sh --pdf), however when the Rd
file is converted to text or html this command is converted to
"<=q".

A workaround is to use \le instead of \leq which works with my LaTeX
distribution (MiKTeX 2.3.?). Another way would be to change Rdconv.pm by
adding \leq and \geq to the substitution lists in text2html, text2txt and
the other similar functions.

I don't know much about LaTeX so it may be that \leq has been phased out in
favour of \le and the books and websites I read might be out of date.

Cheers,
Tim Keighley
> version
         _
platform i386-pc-mingw32
arch     i386
os       mingw32
system   i386, mingw32
status
major    1
minor    8.1
year     2003
month    11
day      21
language R

	[[alternative HTML version deleted]]

On Thu, 11 Dec 2003 Tim.Keighley@csiro.au wrote:
> Hi,
> 
> When writing formulae in Rd files I use \leq to get a less-than-or-equal-to
> sign, as this is what the LaTeX references I consulted suggested. This
works
> correctly for the PDF output (Rcmd Rd2dvi.sh --pdf), however when the Rd
> file is converted to text or html this command is converted to
"<=q".
> 
> A workaround is to use \le instead of \leq which works with my LaTeX
> distribution (MiKTeX 2.3.?). Another way would be to change Rdconv.pm by
> adding \leq and \geq to the substitution lists in text2html, text2txt and
> the other similar functions.
> 
> I don't know much about LaTeX so it may be that \leq has been phased
out in
> favour of \le and the books and websites I read might be out of date.
\leq is not an Rd command, so you should be using e.g.

\eqn{X \leq 4}{X \le 4}

if you want to use it.  You may find that in your setup \le and \leq give 
different glyphs.  Standard latex says

/TeX/fptex/texmf/tex/latex/base/fontmath.ltx:   \let\le=\leq

where \leq is the glyph name in the CM symbol fonts.  MASS is typeset with
\let\le=\leqslant.

-- 
Brian D. Ripley,                  ripley@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 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595