Using dates for plotting
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