I want to add identifier column (Date) to a time series data frame. I want
to name the "Date" column be from 1 to 30 every 1440 rows.
Say I have a data like this (I simply my actual data here):
$dat
ID Var
1 1
2 4
3 6
4 7
5 7
6 8
How can I add identifier column (Date) from 1 to 3 every 2 rows and have
output like this:
ID Var Date
1 1 1
2 4 1
3 6 2
4 7 2
5 7 3
6 8 3
Thanks,
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