Thanks. How do I use this to calculate a new variable (e.g."data$next_month") from an existing variable (e.g."Data$date_"). I tried : <data$next_month<-seq(as.Date(data$date_), len = 2, by = "month")[2]>, but get the following error message: "Error in seq.Date(as.Date(data$date), len = 2, by = "1 month") : 'from' must be of length 1" Thanks.
Gabor Grothendieck <[EMAIL PROTECTED]> wrote: Try this: seq(as.Date("2005-01-15"), len = 2, by = "month")[2] or here is another approach: http://finzi.psych.upenn.edu/R/Rhelp02a/archive/61570.html On 10/11/05, t c wrote: > > Within an R dataset, I have a date field called "date_". (The dates are in > the format "YYYY-MM-DD", e.g. "1995-12-01".) > > > > How can I add or subtract "1 month" from this date, to get "1996-01-01" or " > "1995-11-01". > > > > > > --------------------------------- > > [[alternative HTML version deleted]] > > > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html > > --------------------------------- --------------------------------- [[alternative HTML version deleted]] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html