[R] How to delete duplicate cases?

[Henrique Dallazuanna]

Try this:

 aggregate(x$rank, list(cno=x$cno), max)

On 7/24/08, Daniel Wagner <danieljm1976 at yahoo.com> wrote:
> Dear R users,
>
> I have a dataframe with lot of duplicate cases and I want to delete duplicate ones which have low rank and keep that case which has highest rank.
> e.g
>
> > df1
>   cno      rank
> 1  1342    0.23
> 2  1342    0.14
> 3  1342    0.56
> 4  2568    0.15
> 5  2568    0.89
>
> so I want to keep 3rd and 5th  cases with highest rank (0.56 & 0.89) and delete rest of the duplicate cases.
> Could somebody help me?
>
> Regards
>
> Daniel
> Amsterdam
>
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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O