[R] concatenating two vectors

[R. Michael Weylandt]

On Fri, Sep 14, 2012 at 1:54 PM, Özgür Asar <oasar at metu.edu.tr> wrote:
> Dear all,
>
> I want to concatenate the elements of two vectors such as
>
> a<-c("a1","a2")
> b<-c("b1","b2")
>
> and obtain
>
> "a1b1", "a1b2","a2b1","a2b2"
>
> I tried the paste and paste0 functions, but they yielded elementwise
> concatenation such as
>
> "a1b1","a2b2"
>
> I am wondering that is there an efficient way of doing my wish, for instance
> without using for loop etc.

This is in the general frame of things which look like 'outer' (or
Cartesian) products so you'll want to use the outer() function.

I believe

outer(a, b, FUN = paste0)

should work.

Cheers,
Michael

>
> Best
>
> Ozgur
>
>
>
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