Re: [Rd] R-devel Digest, Vol 100, Issue 28

From: Duncan Murdoch <murdoch.duncan_at_gmail.com>
Date: Wed, 29 Jun 2011 14:08:08 -0400

On 29/06/2011 1:44 PM, Duncan Murdoch wrote:
> On 29/06/2011 1:09 PM, Uwe Ligges wrote:
> >
> > On 29.06.2011 13:41, John Maindonald wrote:
> > > I get the same style of path as Hadley. This is on Windows 7 Home Premium with SP1.
> > > I start R by clicking on the R-2.31.0 icon.
> > >
> > > I'd assumed that it was a change that came with R-2.13.0!
> > > (On 32-bit Windows XP, which I have just checked, I do indeed get the 8.3 paths.)
> > >
> > >> R.home()
> > > [1] "C:/Programs/R/R-2.13.0"
> >
> >
> > No, you got the same as Duncan: This is 8.3 compatible.

>
>

> Yes, that's right. The documentation is pretty inaccurate. What
> actually is supposed to happen is that you get the actual path, with
> forward slashes in it, unless it contains spaces: then you get the 8.3
> version. So John's path has no spaces, and doesn't get converted to
> 8.3. True 8.3 would also have uppercase PROGRAMS, and only one dot in
> R-2.13.0 (I forget how that is converted).

I've now clarified the help page. R.home() just looks up the environment variable R_HOME, and then possibly adds some subdir to it. If your front end (e.g. Hadley's rj/Eclipse setup) doesn't initialize R_HOME properly, then you'll get whatever it put there. You can also mess with it using Sys.setenv(R_HOME="junk").

Duncan Murdoch



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