Hi:
count() is a much faster function than ddply() in this circumstance.
x<- c(1,2,3,4,5,1,2,3,4)
y<- c(1,2,3,4,5,1,2,4,1)
d <- data.frame(x, y)
library(plyr)
count(d, c('x', 'y'))
x y freq
1 1 1 2
2 2 2 2
3 3 3 1
4 3 4 1
5 4 1 1
6 4 4 1
7 5 5 1
HTH,
Dennis
On Tue, Jun 21, 2011 at 11:30 AM, Idris Raja <idris.r...@gmail.com> wrote:
> I have a dataframe df with two columns x and y. I want to count the number
> of times a unique x, y combination occurs.
>
> For example
>
> x<- c(1,2,3,4,5,1,2,3,4)
> y<- c(1,2,3,4,5,1,2,4,1)
>
> df<-as.data.frame(cbind(x, y))
>
> #what is the correct way to use ddply for this example?
> ddply(df, c('x','y', summarize, ??)
>
> #desired output -- format and order doesn't matter
> # (x, y) count
> #--------------------
> # (1, 1) 2
> # (2, 2) 2
> # (3, 3) 1
> # (4, 4) 1
> # (5, 5) 1
> # (2, 3) 1
> # (3, 4) 1
> # (4, 1) 1
>
> [[alternative HTML version deleted]]
>
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>
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