On 2012-07-19 05:56, penguins wrote:
Thanks William, that works fantastically!
I had a quick play with my data and have realised a potential problem in
that if an individual ends the series at home it records an additional
trip-no when one wasnt made. I was wondering whether you could think of a
way to alter it slightly so that the increment works on the 0 rather than
the 1;
for example:
land<-c(0,0,0,0,1,1,1,0,0,0,1,1,0,0,0,0)
the "trip_no" sequence produced would be 1,1,1,1,1,1,1,2,2,2,2,2,3,3,3,3
[It would have been nice if you had included context - not everyone
uses the Nabble interface.]
Bill Dunlap's solution to your problem as originally stated was:
cumsum(c(TRUE, diff(land)==1))
I think that your new requirement is satisfied with
cumsum(c(TRUE, diff(land) == -1))
Unless, of course, I'm misinterpreting something.
Peter Ehlers
Many thanks
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