Would
levels(fff) <- c("A","S","U")
not work? Can you send an example?
-Christos
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Rolf Turner
> Sent: Wednesday, October 03, 2007 12:58 AM
> To: r-help list
> Subject: [R] Factor levels.
>
>
> 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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