[Rd] Link to pdf documentation from other package ?

Duncan Murdoch murdoch at stats.uwo.ca
Tue Nov 24 16:26:10 CET 2009

On 11/24/2009 8:20 AM, Gabor Grothendieck wrote:
> On Wed, Nov 18, 2009 at 8:29 AM, Duncan Murdoch <murdoch at stats.uwo.ca> wrote:
>>> you could use the Sweave like macro to compute the path inside the Rd
>>> environments
>>> \Sexpr{file.path(system.file(package="AlgDesign", "doc"),
>>> "AlgDesign.pdf")}
>>> described in 'Writing R extensions' 2.11
>>> <http://stat.ethz.ch/R-manual/R-patched/doc/manual/R-exts.html#Dynamic-pages>
>> That won't work with dynamic help. (It surprised me, too.)  You can't link
>> to the file system from within the dynamic help pages.  You can't link to a
>> file:// link, which is what you'd need to get that to work.
>> This is a browser restriction, for security reasons.  You don't want
> I am able to read files from my file system from the browser.  For
> example enter this into the Windows command line:
> echo some dummy text > dummy.html
> echo "<a href=dummy.html>dummy</a>" > test-read-file.html
> test-read-file.html
> and click on dummy when the contents of test-read-file.html appears in
> the browser.
> For me, it causes the contents of the dummy.html file to appear in the
> browser.  I am on Windows Vista and I tried it in IE8, Firefox 3.5.5
> and Chrome 3.0 and it worked in all three.

The rule in most browsers is that pages retrieved via http:// links 
can't link to file:// links.  Presumably your local file was already a 
file:// link.

Duncan Murdoch

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