Hi Geeti,

If d is your data.frame, the following is an option:

as.data.frame.table(with(d, tapply(Count, list(x1, x2), sum)))

HTH,
Jorge


On Thu, Jun 3, 2010 at 11:18 AM, Geeti Khan <> wrote:

> Hi,
> I have a dataset with three column like this
> x1 x2 Count
> 1  0  523
> 1 0 23
> 0 0 2
> 0 1  45
> 0 0  3
> 1 1 433
>
> I need to create a loop so that when c(x1,x2)=c(1,1), I can add the
> corresponding Counts.When c(x1,x2)=c(1,0), can add the corresponding counts
> and so on. Can anyone help me????
>
>
>
>
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>
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