Hi:

This is probably not quite what you had in mind, but both work for your
example -  I think the second is probably easier.

x <- c("a", "b")
y <- c("x", "y")

as.vector(outer(x, y, function(x, y) paste(x, y, sep = '')))
[1] "ax" "bx" "ay" "by"
apply(expand.grid(x, y), 1, paste, collapse = '')
[1] "ax" "bx" "ay" "by"

HTH,
Dennis

On Fri, Mar 11, 2011 at 2:53 AM, Rainer M Krug <r.m.krug@gmail.com> wrote:

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> Hash: SHA1
>
> 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
>
> - --
> Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
> Biology, UCT), Dipl. Phys. (Germany)
>
> Centre of Excellence for Invasion Biology
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> email:      Rainer@krugs.de
>
> Skype:      RMkrug
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> FTIAniqqbmpkvqnglOM/FlCUMwbGfgbe
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