You can use aggregate:
aggregate(x[,c('x2','x3')], x['x1'], min)
On Fri, Oct 2, 2009 at 12:43 AM, Kavitha Venkatesan
<kavitha.venkate...@gmail.com> wrote:
> Hi,
>
> I have a data frame that looks like this:
>
>>x
>
> x1 x2 x3
> A 1 1.5
> B 2 0.9
> B 3 2.7
> C 7 1.8
> D 7 1.3
>
> I want to "group" by the x1 column and in the case of multiple x$x1 values
> (e.g., "B")d, return rows that have the smallest values of x2. In the case
> of rows with only one value of x1 (e.g., "A"), return the row as is. How can
> I do that? For example, in the above case, the output I want would be:
>
> x1 x2 x3
> A 1 1.5
> B 2 0.9
> C 7 1.8
> D 7 1.3
>
>
> Thanks!
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
