[R-SIG-Mac] RSwitch - making it easier to test pre-release versions of R

stefano iacus stefano.iacus at unimi.it
Wed Sep 13 17:25:14 CEST 2006

We discussed this in the past and now you remind me the point with  
the announcement of this nice utility.
I know it can be for this release (I'm just writing it here as a  
memo) but this might be considered as a feature request:

it would be nice to include RSwitch inside R.app with a panel showing  
which versions of the Framework are compatible with the particular  
version of R.app currently running (probably not too much variability  
though). The selected version would be used at next start of R.app  
(like when you choose OS X system disk for next boot) and of course a  
"restart now" button would be nice as well.

The restart button is something I really miss in daily use,  
independently from the above feature request.


On 14/set/06, at 00:04, Simon Urbanek wrote:

> In case you didn't know it is possible to have multiple R versions
> installed on your Mac. The R framework uses a versioning system that
> can keep multiple R versions in parallel at /Library/Frameworks/
> R.framework/Versions
> You can change the current version by setting the "Current" symlink
> there. For those as lazy as me there is now a small GUI tool now
> available at
> http://r.research.att.com/
> (on the bottom) which I call RSwitch and it allows you to change the
> current R version in one click. Since we are getting close to the
> beta stage of the next release, the best use of it is once you
> install the current alpha/beta version of R to switch between the pre-
> release and your old R version as necessary.
> Note: even if you switch the current R version, you will still need
> to use the corresponding version of the GUI as well, otherwise
> strange things will happen. Switching versions while R is running can
> also have undesirable effects if you try to load packages after the
> change as they will be loaded from the wrong version of R, so use
> with care.
> Cheers,
> Simon
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