R-3.0.1 (use all digits for describing an R version) is not the problem.
Most likely you are masking a function
or something like that. When you started the R session, did you get a
message about "restoring a previous session"?
If so, then close R, find the directory in which you were working and
I am teaching a summercourse this and the next week where the students are
using R.
We have downloaded and use the new version R.3.0. It has worked perfectly until
today where some of the basic functions have started NOT to work.
Examples are sd() and lm ()
The message we get is Error: c
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