Heinz,
> x <- c("a","b","c")
> lettersnum <- 1:length(letters[])
> names(lettersnum) <- letters[]
> lettersnum[x]
> > lettersnum[x]
> a b c
> 1 2 3
i'm not sure if the following is obviously better, but one might do
----
> b <- match(a, a)
> names(b) <- a
> b
a b c
1 2 3
----
cheers, Greg
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