[R] apply question

[R. Michael Weylandt]

You don't need loops or apply with paste since it's vectorized:

x <- data.frame(n = 1:5, l = letters[1:5], stringsAsFactors = FALSE)

paste(x[,1], x[,2], sep = "_")

Cheers,
Michael

On Tue, Aug 21, 2012 at 10:57 AM, Chet Seligman <chet.seligman at gmail.com> wrote:
> This works, where zz is a dataframe:
>
> for(i in 1:nrow(zz)) {
>      zzz[i,1]<-paste(zz[i,1],zz[i,2],sep="_")
>      }
>
> I would like to use "apply" to concatentate two columns of text along with
> a separator.
> How?
>
> Chet
>
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