Try this:
m <- as.data.frame(m)
m.new <- sapply(split(m, m$V2), function(x)paste(x$V1, collapse="|"))
On Mon, Jun 23, 2008 at 10:10 AM, Daren Tan <[EMAIL PROTECTED]> wrote:
>
>
> I tried aggregate, apply etc, but can't get the right result.
>
> For example,
>
> m <- cbind(c(LETTERS[1:5]), c("aa", "bb", "cc", "aa", "cc")) [,1]
> [,2][1,] "A" "aa"[2,] "B" "bb"[3,] "C" "cc"[4,] "D" "aa"[5,] "E" "cc"
> how to obtain m.new where "aa", "bb", and "cc" are groups, and more than
> one values "A" to "E" belonging to the same group are separated by "|"
> [,1] [,2][1,] "aa" "A|D"[2,] "bb" "B"[3,] "cc" "C|E"
>
>
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--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
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