Re: [R] Averaging dates?

From: Achim Zeileis <Achim.Zeileis_at_wu-wien.ac.at>
Date: Wed, 20 Jun 2007 20:01:09 +0200 (CEST)


On Wed, 20 Jun 2007, SÚrgio Nunes wrote:

> Hi,
>
> What's the best way to average dates?
> I though mean.POISXct would work fine but...
>
> > a
> [1] "2007-04-02 19:22:00 WEST"
> > b
> [1] "2007-03-17 16:23:00 WET"
> > class(a)
> [1] "POSIXt" "POSIXct"
> > class(b)
> [1] "POSIXt" "POSIXct"
> > mean(a,b)
> [1] "2007-04-02 19:22:00 WEST"
> > mean(b,a)
> [1] "2007-03-17 16:23:00 WET"
Would you usually call mean() in this way?   mean(1, 2)
  mean(2, 1)

Probably not...

mean() expects a vector, try mean(c(a, b))! Z

> ?!
>
> Thanks in advance for any advice,
> --
> SÚrgio Nunes
>
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> and provide commented, minimal, self-contained, reproducible code.
>
>



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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. Received on Wed 20 Jun 2007 - 18:05:38 GMT

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