Linking to documentation from a vignette using markdown?

Hi, Duncan:


On 10/18/2015 8:18 PM, Duncan Murdoch wrote:

On 18/10/2015 5:51 PM, Spencer Graves wrote:

Hello:


        What's the preferred way to link to package documentation from a
vignette using markdown?


        My current draft includes
"[cumsum](https://stat.ethz.ch/R-manual/R-devel/library/base/html/cumsum.html)"
to link to the help page for cusum{base} and
"[KFAS](https://rweb.crmda.ku.edu/cran/web/packages/KFAS/KFAS.pdf)" to
link to the pdf documentation for the KFAS package.  This works, but it
feels like an ugly hack, and I wonder if there might be some more
elegant way of doing this (documented in a fine manual I have yet to find)?

You can include links that work only when R is displaying the help using
relative URLs like

../../base/help/cumsum

or

../../base/html/cumsum.html

(The former is like doing ?cumsum, i.e. it uses the alias; the latter
goes directly to a page by its name.)

The advantage of this kind of link is it doesn't need an Internet
connection, it works with the R help system; the disadvantage is that it
only works when the help system is running, so those links won't work in
the copy of your vignette on CRAN, for example.

       Thanks.  I think I saw links like these reading html trying to 
find what I needed for [KFAS];  this helps me understand what I read.  I 
think I'd prefer having links that work in a pdf that I could pass to 
someone who may not have R installed.


       What's the easiest way to find links like the absolute web 
address I gave for [KFAS]?  It took me a couple of hours, because I 
couldn't find how to get more than "https://rweb.crmda.ku.edu/cran/" 
from any of my current web browsers (Safari, Chrome, and SeaMonkey on OS 
X 10.11, Internet Explorer, Chrome, FireFox and SeaMonkey under Windows 7).