[R] How to delete duplicate cases?

From: Daniel Wagner <danieljm1976_at_yahoo.com>
Date: Thu, 24 Jul 2008 07:00:24 -0700 (PDT)

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?

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