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

[Rainer M Krug]

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On 03/11/2011 12:48 PM, Eik Vettorazzi wrote:
> or even simpler
> paste(rep(x,each=length(y)),y,sep="")

I like that one - it makes perfect sense. I might wrap it into a
function and use it.

> 
> 
> Am 11.03.2011 12:44, schrieb 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="")))

I remember the interaction function - but then ther is the trouble with
factors - and I am always trying to avoid those.

Thanks a lot,

Rainer

>>
>> 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
>>>
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
> 


- -- 
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
Biology, UCT), Dipl. Phys. (Germany)

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