[R] problem with plot() and POSIXt dates

[Prof Brian Ripley]

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On Thu, 4 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?
>
> thks.
>
>
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>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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