Re: [R] Problem with plot() and POSIXt dates

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Fri 05 Jan 2007 - 11:12:56 GMT

No attachment arrived: see the posting guide for handling attachments. But in any case the posting guide says

   If you are using an old version of R and think it does not work    properly, upgrade to the latest version and try that, before posting.

and your version of R is ancient. Note, 'before posting' ....

On Fri, 5 Jan 2007, COMTE Guillaume wrote:

>
>
> Hy all,
>
>
>
> I'm plotting graphs using plot() function, they are on X axes POSIX dates:
>
> "POSIXt" "oldClass" "POSIXct" "POSIXlt"
>
> I can't figure out why sometimes it prints the month and days and sometimes it prints the unix timestamp.
>
> It appens usually when the xlim is short like only some days.
>
> xlim is settled as a POSIXt like this
>
> "2006-12-30 17:25:44 CET" "2007-01-02 03:16:51 CET"
>
> On the graph it prints : 1167500000 and 1167700000 instead of dates.
>
> And the result gives a x axes in unix timestamps as if the plot function didn't recognize that it is a timestamp but just an integer.
>
> What am i missing, since R sees itself that it is time stamps and not integer when xlim is enougth large, how do i tell the plot function to see these numbers as POSIXt?
>
> I put an attachement, inside there is an example that demonstrate what i experience (hope it won't be deleted, it is a tar.gz archive made using debian under
>
> R version 2.1.0, 2005-04-18, i386-pc-linux-gnu
>
> attached base packages:
>
> [1] "methods" "stats" "graphics" "grDevices" "utils" "datasets"
>
> [7] "base").
>
>
>
> thks.
>
> COMTE Guillaume
>
> Ingénieur Projet
>
> Alliance Technologies
>
> Projet Philharmonie
>
> 24 rue Martre
>
> 92110 Clichy
>
> Tel : 01 40 87 48 06
>
> Fax : 01 40 87 48 14
>
>
>
>

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595


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Received on Sat Jan 06 01:53:21 2007

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