hello all, this is my reproducible example data frame
test<-structure(list(date = structure(c(1262300400, 1262304000, 1262304000, 1262307600, 1262307600, 1262311200, 1262311200, 1262314800, 1262314800, 1262318400, 1262318400, 1262322000, 1262322000, 1262325600, 1262325600, 1262329200, 1262329200, 1262332800, 1262332800, 1262336400, 1262336400, 1262340000, 1262340000, 1262343600, 1262343600, 1262347200, 1262347200, 1262350800, 1262350800, 1262354400, 1262354400, 1262358000, 1262358000, 1262361600, 1262361600, 1262365200, 1262365200, 1262368800, 1262368800, 1262372400, 1262372400, 1262376000, 1262376000, 1262379600, 1262379600, 1262383200, 1262383200, 1262386800), class = c("POSIXct", "POSIXt" ), tzone = "")), .Names = "date", row.names = c(NA, -48L), class = "data.frame") given that, my objective is to create a new variable accounting for the julian day (i.e. the number of consecutive days elapsed from a fixed origin date) and these are (among many others) my (most) unsuccessful attempts… library(chron) #not working! test$jday<-julian(test$date, origin=as.POSIXct(test$date)) #not working! test$jday<-julian(test$date, origin=test$date) #not working! test$jday <-julian(as.Date(test$date, "%m"), as.Date(test$date, "%d"), as.Date(test$date, "%Y"), origin=c(month=1, day=0, year=2010)) any help for this? thanks a lot max -- View this message in context: http://r.789695.n4.nabble.com/julian-day-form-POSIXt-object-tp3855885p3855885.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.