>>>>> Loris Bennett <loris.benn...@fu-berlin.de>
>>>>> on Thu, 8 Oct 2015 12:07:20 +0200 writes:
> Dear Luca, Luca Cerone <luca.cer...@gmail.com> writes:
>> Dear Loris and Wolfgang, thanks a lot for the help!
>>
>> I wasn't aware of the module project. I'd rather use the
>> "official" way of having co-existent R versions in this
>> case, but is a good tool to know!
> As far as I can tell from a quick look, "R Installation
> and Administration", as referred to by Wolfgang, just
> tells you how to install different versions in different
> places by using the configuration option --prefix (for
> Linux at least). This is some thing you always have to
> do, if you want to install several versions in parallel.
> However, once you have multiple versions installed, you
> need a mechanism to allow users to choose between them.
> This is where Environment Modules come in. At the
> simplest level, they just allow environment variables to
> be set and unset in an easy and consistent way.
> So it is not a question of "using the 'official' way of
> having co-existent R versions", but rather of installing
> various versions and then enabling people to choose easily
> between them.
> Or have I missed some intrinsic feature of R which will
> allow me to switch between installed versions without
> having to explicitly tweak environment variables?
Yes, you have missed something.
I have installed many dozen versions of R simultaneously both at
work and on my laptop ... all under Linux.
(Yes, I am extreme - as R Core member wanting to be able to go
back and see ...)
I don't need any environment variables, but just symbolic links
to define 'R', 'R-devel', 'R-patched', 'R-3.2.2', etc etc. in
our default PATH.
So these work from the shell (or similar), and
even ESS (Emacs Speaks Statistics) is automagically picking up
all these, so I can use
M-x R
M-x R-3.2.2
M-x R-devel
etc
to have different versions of R running simultaneously "inside" ESS.
Martin
> Cheers,
> Loris
> --
> This signature is currently under construction.
(let's you'll converge ;-)
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