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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