We have installed a new tool to manage varying software environments: module. Upcoming R and Matlab upgrades will require the use of that command in your qsub jobs (point-and-click interactive sessions will be automatically updated). It's simple enough:
module load R
for whatever is the default version and
module load R/MKL/3.0.2
for a specific version (here the MKL-linked High Performance version of R, version 3.0.2).
To the extent possible, this means we will no longer uninstall old software (unless a license is no longer valid), and that you can "pin" a particular version of the software in your programs.
A help page has been put together.