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

[Tobias Verbeke]

On 06/29/2011 08:08 PM, Duncan Murdoch wrote:
> 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

For the record, Eclipse/StatET makes use of an R_HOME variable
as set by the user (not as initialized by the front-end)
in a so called 'R Environment' under

Window > Preferences > StatET > Run/Debug > R Environments

Best,
Tobias

> mess with it using Sys.setenv(R_HOME="junk").
>
> Duncan Murdoch
>
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