I've been trying to do this for a week now, with no success. I have a csv file that has data in three columns and looks like this

NAME, IN, OUT
a, 10, 20
b, 10, 30
c, 50, 20
d, 20, 60

Then I take the IN and OUT numbers and do some processing on them which is not relevant. But at the end I output the IN and OUT in lists like this:
IN:
row1: 10, 50
row2: 20, 10

OUT:
row1: 20, 60
row2: 20, 30

This is all good so far, the problem is that I also want to give these IN and OUT lists by the name (for the values that correspond to more than one name, I just want to give them in the order they appear). In this case:
IN:
row1: a, c
row2: d, b

OUT:
row1: a, d
row2: c, b

Any help would be greatly appreciated.

In reply to Linking data together by perlUser345

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