[Rd] (PR#13287) Line breaks in mathematical formulae in Rd files

[Prof Brian Ripley]

I think the 'problem' is a lack of attention to the manual.

   deqn gives “displayed equations” (as in LaTeX's displaymath environment,
   or TeX's $$...$$).

seems pretty clear to me, and I hope to any LaTeX user.

On Fri, 14 Nov 2008, xieyihui at gmail.com wrote:

> Hi,
>
> This is a problem about writing R documentation (R-exts 2.6). The
> command "\deqn" defined in "Rd.sty" is:
>
> \newcommand{\deqn}[2]{\[#1\]}
>
> which will put mathematical formulae in the "displaymath" environment;

Well, surprise, surprise it does what it is documented to do!

> that means line breaks are not allowed (or will not be shown) in
> formulae, but sometimes we do need multiple lines of formulae. One
> solution is to write several equations using "\deqn", but I think to
> change the definition of "\deqn" is better:
>
> \newcommand{\deqn}[2]{\begin{eqnarray*}#1\end{eqnarray*}}

That will change the spacing.

> This will not change the pdfLaTeX output effect, moreover, line breaks
> and alignments using "&" will be available in math formulae.

Not to the non-latex conversions.

> Regards,
> Yihui
> --
> Yihui Xie <xieyihui at gmail.com>
> Phone: +86-(0)10-82509086 Fax: +86-(0)10-82509086
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>
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-- 
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 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595