Rainer,
  The are probably lots of ways, I'd use

levels(interaction(c("a", "b"), c('x', 'y'), sep=''))

  Dave

>Hi
>
>I know there is a function - I have used it before - but I always forget
>what it is called...
>
>I need the combination of two character vectors, i.e:
>
>x <- c("a", "b")
>y <- c("x", "y")
>
>z <- THEFUNCTION(x, y)
>
>z == c("ax", "ay", "bx", "by")
>
>I promise I will write the name of the function on my desk!
>
>Thanks,
>
>Rainer

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