[Rd] Use of MathJax (or something similar) in .Rd files

[Duncan Murdoch]

On 30/04/2020 6:15 a.m., Viechtbauer, Wolfgang (SP) wrote:
> Interesting. I gave this a try, but couldn't make this work. One would have to infuse something like
> 
> <script id="MathJax-script" async
>    src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js">
> </script>
> 
> or
> 
> <script id="MathJax-script" async
>    src="<url-to-your-site>/mathjax/tex-chtml.js">
> </script>
> 
> into the .html file, but just adding this to the .Rd file (directly or wrapped with \if{html}{}) doesn't do that (it just gets printed). If somebody has already successfully done this, I would be interested in hearing how.

You'd need to wrap that code in \out (inside the conditional, i.e. 
something like

\if{html}{\out{<script id="MathJax-script" async 
src="<url-to-your-site>/mathjax/tex-chtml.js"></script>}}

Duncan Murdoch

> 
> Best,
> Wolfgang
> 
>> -----Original Message-----
>> From: Gábor Csárdi [mailto:csardi.gabor using gmail.com]
>> Sent: Thursday, 30 April, 2020 11:51
>> To: Viechtbauer, Wolfgang (SP)
>> Cc: r-devel
>> Subject: Re: [Rd] Use of MathJax (or something similar) in .Rd files
>>
>> You can probably already do this using the \if{html} conditional, and
>> either including the matchjax js files in the package, or getting them
>>from a CDN.
>>
>> Gabor
>>
>> On Thu, Apr 30, 2020 at 9:13 AM Viechtbauer, Wolfgang (SP)
>> <wolfgang.viechtbauer using maastrichtuniversity.nl> wrote:
>>>
>>> Hello All,
>>>
>>> I am wondering if there has ever been any discussion/consideration given
>> to incorporating MathJax (or something similar) into R for rendering
>> equations in .Rd files. I know that equations are rendered beautifully in
>> the pdf manuals, but I suspect the majority of users primarily look at the
>> html help files when using R. While I am comfortable reading something like
>> "B_x(a,b) = integral_0^x t^(a-1) (1-t)^(b-1) dt", it would definitely be
>> nicer if this was shown as a 'proper' equation.
>>>
>>> Best,
>>> Wolfgang
>>>
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