Hi Steve-

Unfortunately, your e-mail came about 10 minutes too late for me. I did indeed destroy my old version (3.0) of R. I did use the R-devel*.pkg available at att.com<http://att.com> but I must have missed the installer prompt that prevented it from killing my current release install.

Do you have any advice for how I can fix this? I tried to restore my release version of R from a Time Machine backup but I still get the message “R cannot be opened because of a problem”.

thanks,
Kristina
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Kristina Fontanez, Postdoctoral Fellow
fontanez@mit.edu<mailto:fontanez@mit.edu>
Massachusetts Institute of Technology
Department of Civil and Environmental Engineering
48-120E
15 Vassar Street
Cambridge, MA 02139



On Jan 17, 2014, at 5:05 PM, Steve Lianoglou <lianoglou.steve@gene.com<mailto:lianoglou.steve@gene.com>> wrote:

Hi,

Perhaps a more user-friendly way to run w/ both versions is to simply
install the R-devel *.pkg available from http://r.research.att.com<http://r.research.att.com/>
specifically:

http://r.research.att.com/snowleopard/R-devel/R-devel-snowleopard-signed.pkg

Make sure you pay close attention to the installer and follow the
instructions provided in the splash window so that the installation
doesn't blow out your current (release) install (this will involve
running some command from the terminal that has to do w/ the install
receipts, or something).

Then, to switch between R and R-devel, you "simply" use the RSwitch
app available from the same site:

http://r.research.att.com/RSwitch-1.2.dmg

Which is an app front end w/ simply does some swapping of symlinks so
that the right links point to the right version of R that you want to
run.

Note that I believe this approach isn't amenable to running both
versions of R *at the same time.*

-steve


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