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2010 May 24
2
sum of certain length
Hi r-users,
I have this data below. I would like to obtain the weekly rainfall sum. That is I would like to find sum for day 1 to day 7, day 8 - day15, and so on.
year month day rain
1 1922 1 1 0.0
2 1922 1 2 0.0
3 1922 1 3 0.0
4 1922 1 4 0.0
5 1922 1 5 0.0
6 1922 1 6 0.0
7 1922 1 7 0.0
8 1922 1 8 6.6
9 1922 1 9 1.5
10 1922 1 10 0.0
11 1922 1 11 0.0
12 1922 ...