Hi, Try: dat1 <- data.frame(years=rep(1991:1992,12), months=rep(1:12,2),days= rep(1,24)) dat1$day <- format(as.Date(paste(dat1[,1],sprintf("%02d",dat1[,2]),sprintf("%02d",dat1[,3]),sep="."),"%Y.%m.%d"),"%d.%m.%Y") A.K.
On Thursday, November 28, 2013 8:56 AM, eliza botto <eliza_bo...@hotmail.com> wrote: Dear Users of R, I have a data frame with three column, the first column contains years, the second one months and third one, the days (cbind(yyyy mm dd)). I want to combine them so that i have one column with the date format as (dd.mm.yyyy). Is there a way of doing that. Thanks in advance, Eliza [[alternative HTML version deleted]] ______________________________________________ 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. ______________________________________________ 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.