The rle (run length encoding) function is ideal for
problems like this:
y <- c(4,4,4,2,45,12,12)
rr = rle(y)
rep(seq(along=rr$values),rr$lengths)
[1] 1 1 1 2 3 4 4
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spec...@stat.berkeley.edu
On Sat, 27 Mar 2010, sun wrote:
Dear all,
I want to replace an (unsorted) id variable in a large dataset by a running
number without changing the order of the cases.
E.g.,
y <- c(4,4,4,2,45,12,12)
should be replaced by something like
x <- c(1,1,1,2,3,4,4)
Sorry for this simple question & thank you very much for your help!
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