> You typed a ` without closing it:
> barplot(xtab(`profits`,data=Forbes2000))
>
> anyway: pushing the escape button should also return you to
> the R-prompt (at least on a Windows platform)
But why is the OP using a backtick at all? It's not necessary in this instance
(and in fact it's very rarely necessary at all unless you have used a
syntactically invalid name with something silly like spaces in it). See ?Quotes
for a little more detail on what ` does.
Also, xtab should possibly be xtabs, and the first argument to that is a
one-sided formula, not a vector:
> library(HSAUR)
> barplot(xtabs( ~ profits,data=Forbes2000))
should work fine.
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