Installing R 2.12.0 did not overwrite my old 2.11 folder in :
/Library/Frameworks/R.framework/Versions/2.11

RSwitch is able to launch (some) old versions, but I am not sure about all. (I now have a collection going back to 2.7)

http://r.research.att.com/RSwitch-1.1.dmg

--
David.
On Nov 16, 2010, at 11:11 AM, Ken Knoblauch wrote:

Hi,

What's the cleanest way to restore R 2.11.1 without clobbering R 2.12? I know that pkgutil can be used to forget old receipts in order to upgrade to a higher version of R while retaining the lower one and then Rswitch can be used to choose the one to run. But, this didn't seem to work in the reverse direction, i.e., I have R 2.12 patched installed and I tried to install R 2.11.1 after running pkgutil. Rswitch did not record that R 2.11.1 had been installed and the GUI bombed out on startup (I probably
have to install the R 2.11.1 GUI separately).

Do I have to uninstall R 2.12 before reinstalling R 2.11.1 and then do
use pkgutils, or is there a simpler way?

The reason for wanting to do this is that I need to process some documents
using Sweave that use the cacheSweave package, which currently is not
working correctly with R 2.12, even though an update has been promised
imminently.

Thank you.

Ken


--
Ken Knoblauch
Inserm U846
Stem-cell and Brain Research Institute
Department of Integrative Neurosciences
18 avenue du Doyen Lépine
69500 Bron
France
tel: +33 (0)4 72 91 34 77
fax: +33 (0)4 72 91 34 61
portable: +33 (0)6 84 10 64 10
http://www.sbri.fr/members/kenneth-knoblauch.html

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David Winsemius, MD
West Hartford, CT

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