question about sum of (column) elements in R
On 04-12-2012, at 08:59, T Bal wrote:
Hi,
I have the following data:
0 12
1 10
1 4
1 6
1 7
1 13
2 21
2 23
2 20
3 18
3 17
3 16
3 27
3 33
4 11
4 8
4 19
4 16
4 9
In this data file I would like to sum the numbers of second column which
belong to the same number in the first column.
So the output would be:
0 12
1 40
2 64
3 111
etc.
Using Pascal's test object you can also use aggregate aggregate(test$V2,by=list(test$V1),FUN=sum) Berend