M-x R- <tab>
works correctly in Windows.  The condition is that you take the default
location
of the R installer.  All the releases are stored in parallel locations.

On Tue, Jul 26, 2011 at 1:01 PM, Martin Maechler <maechler@stat.math.ethz.ch
> wrote:

> >>>>> "PS" == Paul Shannon <pshannon@systemsbiology.org>
> >>>>>     on Tue, 26 Jul 2011 09:38:17 -0700 writes:
>
>    PS> I have just started to keep (and use) two versions of R
>    PS> and Bioconductor -- the release, and the devel version.
>    PS> How can I modify or adapt of invoke ess so that I run
>    PS> the version I want?
>
> Well, it depends..
>
> If I type (in Emacs)  "M-x R [Tab]",
> where "[Tab]" means to press the tab (tabulator) key,
> I get
>
>   Possible completions are:
>   R    R-1.0
>   R-1.0.0      R-1.0.1
>   R-1.1        R-1.1.0
>   R-1.1.1      R-1.2
>   R-1.2.0      R-1.2.1
>   R-1.2.2      R-1.2.3
>   R-1.3        R-1.3.0
>   R-1.3.1      R-1.4
>   R-1.4.0      R-1.4.1
>   R-1.5        R-1.5.0
>   R-1.5.1      R-1.6
>   R-1.6.0      R-1.6.1
>   R-1.6.2      R-1.7
>   R-1.7.0      R-1.7.1
>   R-1.8        R-1.8.0
>   R-1.8.1      R-1.9
>   R-1.9.0      R-1.9.1
>   R-2-debian   R-2.0.0
>   R-2.0.1      R-2.1.0
>   R-2.1.1      R-2.10.0
>   R-2.10.1     R-2.11.0
>   R-2.11.1     R-2.12.0
>   R-2.12.1     R-2.12.2
>   R-2.13.0     R-2.13.1
>   R-2.2.0      R-2.2.0-Xeon
>   R-2.2.1      R-2.2.1-Xeon
>   R-2.3.0      R-2.3.1
>   R-2.3.1-Xeon         R-2.4.0
>   R-2.4.1      R-2.5.0
>   R-2.5.1      R-2.6.0
>   R-2.6.1      R-2.6.2
>   R-2.7.0      R-2.7.1
>   R-2.7.2      R-2.8.0
>   R-2.8.1      R-2.9.0
>   R-2.9.1      R-2.9.2
>   R-alpha      R-beta
>   R-core-style         R-devel
>   R-devel-32   R-devel-32-Fedora_11
>   R-devel-32-Fedora_13         R-devel-32-debian
>   R-devel-32-memprof   R-devel-64
>   R-devel-64-Fedora_11         R-devel-64-Fedora_13
>   R-devel-64-MM        R-devel-64-RH5
>   R-devel-64-debian    R-devel-64-debian-1
>   R-devel-64-memprof   R-devel-MM
>   R-devel-RH5  R-devel-RHEL
>   R-devel.~1~  R-devel.~2~
>   R-devel.~3~  R-devel.~4~
>   R-devel.~5~  R-devel.~o~
>   R-devel~     R-fix-T-F
>   R-fix-miscellaneous  R-indent-all
>   R-indent-cautiously  R-mode
>   R-newest     R-patched
>   R-patched-32         R-patched-32-Fedora_11
>   R-patched-32-Fedora_13       R-patched-32-debian
>   R-patched-64         R-patched-64-Fedora_13
>   R-patched-64-debian  R-patched-MM
>   R-patched-RHEL       R-patched-shlib
>   R-patched-shlib-64-Fedora_13         R-patched-shlib~
>   R-patched.~1~        R-patched.~2~
>   R-patched.~3~        R-patched.~4~
>   R-patched.~5~        R-patched.~6~
>   R-patched.~7~        R-patched.~8~
>   R-patched.~9~        R-patched_old
>   R-pre-rel    R-rc
>   R-site-search        R-transcript-mode
>   R-valgrind   Rd-describe-major-mode
>   Rd-font      Rd-mode
>   Rd-mode-calculate-indent     Rd-mode-indent-line
>   Rd-mode-insert-item  Rd-mode-insert-section
>   Rd-mode-insert-skeleton      Rd-mode-menu-map
>   Rd-preview-help      Rd-submit-bug-report
>   Rnw-mode
>
> so you see that I get pretty many installed versions of R ...
> and (almost) all are found by ESS automagically at startup.
>
> For that to work they must be in the PATH,
> and that's a concept working nicely in Unix-like OSs, but
> possibly not in Windoze ... which I now guess is what you've got
> ??
>
> Regards,
> Martin Maechler, ETH Zurich
>
> ______________________________________________
> ESS-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/ess-help
>

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