On Thu, 29 Sep 2011, maxbre wrote:
yes, you are perfectly right, sorry for that but for me was not so clear the
error message!
....and the third code example I posted (not working either) should be of
length one (if I'm not wrong again)
but most of all what is not included in my reproducible example and get a
bit confused my question is the case when the variable "date" contains dates
of many years and the objective is to count for each given year the julian
date starting from the first day of the corresponding year
So you aren't really interested in julian day, you are interested in day
of year. Julian day maps all calendar time to number of days from a
SINGLE epoch (origin) which may differ from one problem to the
next, but not from one value to the next within the problem the way
"beginning of year" changes for each value.
how would you deal with this problem?
test$doy <- as.POSIXlt(test$date)$yday+1
thanks a lot for your help
max
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