[R] date operations

[Christophe Dutang]

Thanks a lot

Envoyé de mon iPhone

Le 3 déc. 08 à 00:39, "jim holtman" <jholtman at gmail.com> a écrit :

> 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  
> <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
>>
>>
>>       [[alternative HTML version deleted]]
>>
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>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>
>
> -- 
> Jim Holtman
> Cincinnati, OH
> +1 513 646 9390
>
> What is the problem that you are trying to solve?