If you want to do the addition, 'unclass' the variable:
> alpha2+4
[1] "2008-12-25"
> alpha2 + unclass(alpha1)
[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]]
>
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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>
--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem that you are trying to solve?
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