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        Â
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