Robin Jeffries wrote:
Hallo!
I have a vector of ID's like so,
id <- c(1,2,2,3,3,3,4,5,5)
I would like to create a [start,stop] pair of vectors that index the first
and last observation per ID.
For the ID list above, it would look like
1 1
2 3
4 6
7 7
8 9
which(!duplicated(id))
[1] 1 2 4 7 8
cumsum(rle(id)$lengths)
[1] 1 3 6 7 9
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