Hi Yuan,
Try
dd[order(as.numeric(gsub("[^0-9]", "", dd$b))), ]
HTH,
Jorge
On Thu, May 20, 2010 at 8:28 AM, Yuan Jian <> wrote:
> Hello,
>
> I have a dataframe:
> dd <- data.frame(b = c("chr2", "chr1", "chr15", "chr13"),
> x = c("A", "D", "A", "C"), y = c(8, 3, 9, 9),
> z = c(1, 1, 1, 2))
>
> >dd
> b x y z
> 1 chr2 A 8 1
> 2 chr1 D 3 1
> 3 chr15 A 9 1
> 4 chr13 C 9 2
>
> Now I want to sort them according column "b", but only its number is
> considered:
> b x y z
> 1 chr1 D 3 1
> 2 chr13 C 9 2
> 3 chr15 A 9 1
> 4 chr2 A 8 1
>
> thanks
> jian
>
>
>
>
>
>
> [[alternative HTML version deleted]]
>
>
> ______________________________________________
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>
>
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