[R] Averaging dates?

[Achim Zeileis]

On Wed, 20 Jun 2007, Sérgio 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,
> --
> Sérgio Nunes
>
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