Hi Peter
I have the following data frame with chromosome name, start and end positions:
   chrN     start         end
1 chr1  11122333  11122633
2 chr1  11122333  11122633
3 chr3  11122333  11122633
8 chr3 111273334 111273634
7 chr2  12122334  12122634
4 chr1  21122377  21122677
5 chr2  33122355  33122655
6 chr2  33122355  33122655
I would like to count the positions that have the same start and add a new column with the count number;
the new data frame should look like this:
  chrN     
 start         end              count
1 chr1  11122333  11122633       3
2 chr1  11122333  11122633       3
3 chr3  11122333  11122633       3
8 chr3 111273334 111273634     1
7 chr2  12122334  12122634       1
4 chr1  21122377  21122677       1
5 chr2  33122355  33122655       2
6 chr2  33122355  33122655       2
Can you please show me how to achieve this?
Thanks
Joseph


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