On 10.06.2010 04:48, Mohan L wrote:> Dear All,
>
> I have the data some thing like this, I am showing here three days data
> only:
>
>> dummy.data<- read.table(file='dummy.txt',sep='',
header=TRUE)
>> dummy.data
> StDate Domaindesc Logins
> 1 05/01/10 xxx 10
> 2 05/01/10 xxx 45
> 3 05/01/10 xxx 2
> 4 05/01/10 yyy 45
> 5 05/01/10 yyy 20
> 6 05/01/10 yyy 22
> 7 05/01/10 zzz 34
> 8 05/01/10 zzz 54
> 9 05/01/10 zzz 1
> 10 05/01/10 zzz 0
> 11 05/02/10 yyy 32
> 12 05/02/10 xxx 40
> 13 05/02/10 zzz 23
> 14 05/02/10 yyy 5
> 15 05/02/10 zzz 12
> 16 05/02/10 xxx 19
> 17 05/02/10 xxx 23
> 18 05/02/10 xxx 11
> 19 05/02/10 yyy 9
> 20 05/02/10 zzz 0
> 21 05/03/10 xxx 2
> 22 05/03/10 xxx 21
> 23 05/03/10 xxx 6
> 24 05/03/10 yyy 45
> 25 05/03/10 yyy 43
> 26 05/03/10 yyy 34
> 27 05/03/10 yyy 41
> 28 05/03/10 zzz 31
> 29 05/03/10 zzz 19
> 30 05/03/10 zzz 27
>
> I trying to aggregate(sum) the Logins based on Domaindesc,StDate. I need
> like this :
>
> Domaindesc 05/01/10 05/02/10 05/03/10
> xxx 57 93 29
> yyy 87 46 122
> zzz
>
> Any help will be greatly appreciated.
See ?tapply, e.g.:
tapply(dummy.data[,3], dummy.data[,1:2], sum)
Uwe Ligges
> Thanks for your time.
> Mohan L
>
> [[alternative HTML version deleted]]
>
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