Using dates for plotting

Dear R-Users!

I have the following data:
runs
dates kms
1 2004-01-15 12:00:00   9
2 2004-01-16 12:00:00  10
3 2004-01-17 12:00:00   5
class(runs$dates)
[1] "POSIXt"  "POSIXct"

Is it possible to _easily_ plot these data with real dates shown as
tick marks on the x-axis? Perhaps even when the days are not
continuous but with missing days in between?

Thanks in advance,

  Christoph.
Christoph Lange
MPI fuer biologische Kybernetik  |Phone: +49-7071-601-607|
Postfach 2169, D-72012 Tuebingen |FAX:   +49-7071-601-616|

Dear R-Users!

I have the following data:

runs
dates kms
1 2004-01-15 12:00:00   9
2 2004-01-16 12:00:00  10
3 2004-01-17 12:00:00   5
class(runs$dates)
[1] "POSIXt"  "POSIXct"

Is it possible to _easily_ plot these data with real dates shown as
tick marks on the x-axis? Perhaps even when the days are not
continuous but with missing days in between?
Yes.  ?plot.POSIXct has examples like

     plot(.leap.seconds, 1:22, type="n", yaxt="n",
          xlab="leap seconds", ylab="", bty="n")
     rug(.leap.seconds)

What could be easier?  If you want only the data dates labelled, use
axis.POSIXct.
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)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595
Hi

Dear R-Users!

I have the following data:

runs
dates kms
1 2004-01-15 12:00:00   9
2 2004-01-16 12:00:00  10
3 2004-01-17 12:00:00   5
class(runs$dates)
[1] "POSIXt"  "POSIXct"

Is it possible to _easily_ plot these data with real dates shown as
tick marks on the x-axis? Perhaps even when the days are not
continuous but with missing days in between?
plot(dates,kms)

should work, but you need to do some formating (maybe with 
axes=F and axis())

see ?strptime

and to convert your dates to POSIXct gformat
					 ^^
Beware "dates" is a function name in library chron.

HTH Petr
Thanks in advance,

  Christoph.

-- 
Christoph Lange
MPI fuer biologische Kybernetik  |Phone: +49-7071-601-607|
Postfach 2169, D-72012 Tuebingen |FAX:   +49-7071-601-616|

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