Hi, I was "losing" my dates in a script and upon inspection, found that my recent switch from separate "if" and "else" to "ifelse" was the cause. But why?
my.date = as.POSIXct("2011-06-04 08:00:00") default.date = seq(as.POSIXct("2011-01-01 08:00:00"), as.POSIXct("2011-09-01 08:00:00"), length=15) x = 4 * 60 * 60 (my.date + x) (min(default.date) + x) (new.date = ifelse(!is.na(my.date), my.date + x, min(default.date) + x) ) (if(!is.na(my.date)) new.date2 = my.date + x else new.date2= min(default.date) + x ) On my machine, new.date is "numeric" whereas new.date2 is "POSIXct" and "POSIXt", as desired. sessionInfo() R version 2.13.0 (2011-04-13) Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit) locale: [1] fr_CA.UTF-8/fr_CA.UTF-8/C/C/fr_CA.UTF-8/fr_CA.UTF-8 attached base packages: [1] stats graphics grDevices utils datasets methods base Thanks in advance, Denis ______________________________________________ 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.