[R] access R remotely

[array chip]

Hi,

not sure if this is kind of question that should be
asked here, but here it is:

I am trying to access R installed on a remote cluster
(Linus), but I got the error message that R command
not found when I simply typed "R" after the prompt
after having successfully accessed the remote cluster
using SSH. what could be the reason of the problem? is
the problem on the cluster side or on my side? I am
not a IT person at all, so I don't know much detail...
Our IT guy on the cluster side is working on the
problem, but seems not very efficiently targeting the
problem.

Thanks for any suggestion.