What is odd is that it seems to run ok if we call "+.Date" directly:
> "+.Date"(alpha1, alpha2) [1] "2009-02-15" On Tue, Dec 2, 2008 at 4:10 PM, Christophe Dutang <[EMAIL PROTECTED]> wrote: > Hi all, > > I'm dealing with dates in R (2.7.2), but some basic operations raise a > warning. > > Incompatible methods ("+.Date", "Ops.difftime") for "+" > > I saw this topic in this mailing list, but I do not understand what to > do... > > cf. https://stat.ethz.ch/pipermail/r-help/2008-June/165842.html > > Do I have to convert Dates to numeric? > > Thanks in advance > > Christophe > > PS : R script used > > alpha2=as.Date("2008-12-21") > alpha1=as.Date("2008-12-21")-as.Date("2008-10-26") > alpha1 > alpha2 > alpha1+alpha2 > > > [[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.