[R-pkg-devel] Macros in Rd files.

Rolf Turner r.turner at auckland.ac.nz
Thu Nov 9 21:05:29 CET 2017

On 09/11/17 23:40, Duncan Murdoch wrote:
> On 09/11/2017 5:06 AM, Uwe Ligges wrote:
>> Note the % may be a comment?
> Yes, and the body should be written in Rd markup, not R.  Working out 
> the appropriate number of escapes is painful; I recommend trial and error.
> This worked for me:
>   \newcommand{\today}{\Sexpr{format(Sys.Date(),"\\\%d/\\\%m/\\\%Y")}}

Now that is a bit more subtle!  I don't understand what "written in Rd 
markup" really means, and I don't understand the "\Sexpr" construction.
I'd seen it when looking at the example macros in


but I figured if you know nothing about it, don't mess with it.

Is there anywhere that I could read up about writing "in Rd markup"?

Anyway, thanks for giving me the recipe, which is what I really need.



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