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

[Eik Vettorazzi]

Hi Rainer,
I don't know a function for literally substituting "THEFUNCTION", but
x <- c("a", "b")
y <- c("x", "y")
sort(levels(interaction(x,y,sep="")))

or

as.vector(t(outer(x,y,paste,sep="")))

will work. "sort" and "t" respectively here are used to produce the
desired order.
hth.


Am 11.03.2011 11:53, schrieb Rainer M Krug:
> 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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Eik Vettorazzi
Institut für Medizinische Biometrie und Epidemiologie
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