Re: [R] Averaging dates?

From: jim holtman <jholtman_at_gmail.com>
Date: Wed, 20 Jun 2007 17:25:03 -0400

You need to call 'mean.POSIXct' with a single vector:

> a

[1] "2007-01-01 12:00:00 GMT"
> b

[1] "2007-07-01 14:22:00 GMT"
> mean(c(a,b))
[1] "2007-04-02 01:11:00 GMT"
>

On 6/20/07, SÚrgio Nunes <snunes_at_gmail.com> 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"
>
> ?!
>
> Thanks in advance for any advice,
> --
> SÚrgio Nunes
>
> ______________________________________________
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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 you are trying to solve?

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Received on Wed 20 Jun 2007 - 22:03:13 GMT

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