On Apr 3, 2012, at 9:35 AM, Fischer, Felix wrote:
Hello everyone,
i try to identify the first element of a date vector, for which the
following condition holds: at least 3 more dates within the next 365
days, but at least one of these must be between 3-12 month later.
dates = as.Date(sort(rnorm(10,3000,100)), origin = "2000-1-1")
Has anyone an idea how to do this economically? I'll need to apply
this to a large dataset with date vectors of various lengths and I
can think only of quite difficult algorithms :(
which( dates[4:(length(dates))] -dates[1:(length(dates)-3)] <365 &
dates[3:(length(dates)-1)] -dates[1:(length(dates)-3)] > 90)
[1] 2 3
Any ideas would be appreciated,
Felix
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