[R] Factor levels.

[Rolf Turner]

I have factors with levels ``Unit", "Achieved", and "Scholarship"; I  
wish to replace these with
"U", "A", and "S".

So I do

	fff <- factor(fff,labels=c("U","A","S"))

This works as long as all of the levels are actually present in the  
factor.  But if ``Scholarship'' is absent
(as if often is) then I get an error.

I can do a workaround such as

	fff <- factor(c("U","A","S")[fff],levels=c("U","A","S"))

but this seems kludgy to me.

Is there a sexier way?

			cheers,

				Rolf Turner


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