[ESS] Setting paths to R versions in different directories

[Martin Maechler]

On Fri, Oct 17, 2014 at 3:45 AM, Vitalie Spinu <spinuvit at gmail.com> wrote:
>
> Theoretically, it should be enough to have a sim-link of your R binaries
> into your bin path. This seems to work very well for
> Martin. Unfortunately it never worked for me. I have multiple R
> installed and simlinked but I don't see any of them.

I am astonished.. that it doesn't work for you neither, Vitalie.
Are the R versions found in a *shell* buffer inside Emacs?

What OS are we talking about

> I had in plan to check what is going on for ages and never got down to
> it as it never bothered me that much.
>
> As a quick workaround you can have:
>
>    (defun R-x.y.z ()
>      (interactive)
>      (let ((inferior-R-program-name "path/to/xyz/R"))
>        (R)))

Indeed, that used to be my "workaround" i.e., solution, many years
ago, before we had all the auto detection.
Still very strange that it fails for you..
and of course it would phantastic if Vitalie could diagnose the
problem for himself, as the solution would benefit
quite a few people I'm sure.

Martin

>
>  Vitalie
>
>  >>> Brian Hobbs on Thu, 16 Oct 2014 15:51:56 -0400 wrote:
>
>  > Hello all,
>  > I am trying to customize my ESS so that I can easily refer to older version
>  > of R as needed to use packages that are not compatible with the most up to
>  > date R version.
>
>  > I am currently running GNU Emacs 24.1.1 with ESS Version 14.09. I use Emacs
>  > and ESS on a linux server where the main R version is kept at /local/bin/R
>  > which refers to version 3.1.1 via a symbolic link.
>
>  > When I am in Emacs and type M-x R-[tab] I do not see any R versions come up
>  > in my completions list. My current completions list is:
>  > Possible completions are:
>  > R-fix-T-F                 R-initialize-on-start     R-mode
>  > R-newest                  R-site-search             R-transcript-mode
>
>  > I had seen that you could set R-devel in older versions of ESS, but I do
>  > not see that as a variable now.
>
>  > I have explored the variable (ess-r-versions-created) and found its value
>  > to be nil. I then looked at (ess-rterm-version-paths) and also found that
>  > to have a value of nil.
>
>  > I then tried to edit my .emacs file to set the (ess-rterm-version-paths)
>  > variable to the path to R version 3.0.1 located in my bin with the
>  > following addition to my .emacs file under (custom-set-variables
>
>  > '(ess-rterm-version-paths "/udd/user/bin/R-3.0.1")
>
>  > However, this only updated the ess-rterm-version-paths variable and did not
>  > update the ess-r-versions-created variable. So, with this change I could
>  > not use M-x R-3.0.1.
>
>  > I also tried running M-x ess-find-rterm, but this command does not exist
>  > for me.
>
>  > Simply put, I want to find a way to customize ESS so that by default I use
>  > the most updated R version on our server located at /local/bin/R with an
>  > option to easily choose an older version of R local in my personal
>  > directory at /udd/user/bin/R-3.0.1.
>
>  > I would appreciate any help or advice that anyone could offer.
>
>  > Thank you,
>  > Brian
>
>  >      [[alternative HTML version deleted]]
>
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