[R] date operations

[Gabor Grothendieck]

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 <dutangc at gmail.com> 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
>
>
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>
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