[R] order intervals in a data.frame

[Paul Smith]

On 9/6/07, João Fadista <Joao.Fadista at agrsci.dk> wrote:
> I would like to know how can I order a data.frame with increasing the dat$Interval (dat$Interval is a factor). There is an example below.
>
> Original data.frame:
>
> > dat
>                  Interval               Number_reads
>                   0-100                         685
>                200-300                         744
>                100-200                        1082
>                300-400                        4213
>
>
> >Desired_dat:
>
>                  Interval               Number_reads
>                   0-100                          685
>                 100-200                       1082
>                 200-300                         744
>                 300-400                       4213

What about

Desired_dat <- dat[match(dat$Interval,sort(dat$Interval)),]

?

Paul