Displaying 1 result from an estimated 1 matches for "qsum".
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csum
2011 Jan 26
2
hwo to speed up "aggregate"
I have
> df
quantity branch client date name
1 10 1 1 2010-01-01 one
2 20 2 1 2010-01-01 one
3 30 3 2 2010-01-01 two
4 15 4 1 2010-01-01 one
5 10 5 2 2010-01-01 two
6 20 6 3 2010-01-01 three
7 1000 1 1 2011-01-01 one
8 2000 2 1 2011-01-01