Hi,

I have a data frame with two columns. I need to remove duplicated rows in
first column, but I need to do it conditionally to values of the second
column.

Example:

        Point_counts       Psi_Sp

1            A                       0
2            A                       1
3            B                       1
4            B                       2
5            B                       0
6            C                       1
7            D                       1
8            D                       2


I need to turn this data frame in one without duplicated rows at
point-counts (one visit per point) but maintain the ones with maximum value
at Psi_Sp, e.g. remove row 1 and maintain 2 or remove rows 3 and 5 and
maintain 4. At the end I want a data frame like the one below:

         Point_counts           Psi_Sp

1              A                           1
2              B                           2
3              C                           0
4              D                           2

How can I do it? I found several ways to edit data frames, but
unfortunately I cound not use none of them.

I appreciate

Francisco

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