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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