Dear R-Users! I have the following data:> runsdates 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$dates)[1] "POSIXt" "POSIXct">Is it possible to _easily_ plot these data with real dates shown as tick marks on the x-axis? Perhaps even when the days are not continuous but with missing days in between? Thanks in advance, Christoph. -- Christoph Lange MPI fuer biologische Kybernetik |Phone: +49-7071-601-607| Postfach 2169, D-72012 Tuebingen |FAX: +49-7071-601-616|
On Fri, 16 Jan 2004, Christoph Lange wrote:> > Dear R-Users! > > I have the following data: > > > runs > dates kms > 1 2004-01-15 12:00:00 9 > 2 2004-01-16 12:00:00 10 > 3 2004-01-17 12:00:00 5 > > class(runs$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 On 16 Jan 2004 at 12:01, Christoph Lange wrote:> > 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| > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.htmlPetr Pikal petr.pikal at precheza.cz