[R] How to get all combinations between two character vectors?

[Rainer M Krug]

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On 03/11/2011 12:22 PM, Dennis Murphy wrote:
> Hi:
> 
> This is probably not quite what you had in mind, 

No - the second one is the one I used before.

Thanks,

Rainer

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 at gmail.com
> <mailto:r.m.krug at gmail.com>> wrote:
> 
> 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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Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
Biology, UCT), Dipl. Phys. (Germany)

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