On Mon, Feb 9, 2009 at 8:03 AM, clion <birt...@hotmail.com> wrote:
>
> this is good, but it doesn't solve my main problem (which I unfortunately
> din't post - very sorry )
> I would like to filter may data , for example by:
>
> dat.sub<-dat[dat$age>10 & dat$NoCaps>2,]
>
> So I need a column where the number of Captures is repeated for all rows of
> each captured animal.
> (or is there a better way to get a subset?)
Well, you could use merge:
dat <- data.frame( id=c(1,1,1,2,2,2,3), age=c(2,3,4,2,3,5,3),
mass=c(1,2,3,2,3,4,3) )
caps <- tapply(an$id,an$id,length)
merge(dat,caps,by.x=1,by.y=0)
id age mass y
1 1 2 1 3
2 1 3 2 3
3 1 4 3 3
4 2 2 2 3
5 2 3 3 3
6 2 5 4 3
7 3 3 3 1
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