One last item that could be of use: ?timeBasedSeq
Lets you create ranges in any standard format, with simple ISO style formatting. The level of detail you specify is interpreted as the resolution that is desired. e.g. > timeBasedSeq(2000/2008) [1] "2000-01-01" "2001-01-01" "2002-01-01" "2003-01-01" "2004-01-01" [6] "2005-01-01" "2006-01-01" "2007-01-01" "2008-01-01" > timeBasedSeq(2000/200012) [1] "Jan 2000" "Feb 2000" "Mar 2000" "Apr 2000" "May 2000" "Jun 2000" [7] "Jul 2000" "Aug 2000" "Sep 2000" "Oct 2000" "Nov 2000" "Dec 2000" > timeBasedSeq(2000/200012, 'Date') [1] "2000-01-01" "2000-02-01" "2000-03-01" "2000-04-01" "2000-05-01" [6] "2000-06-01" "2000-07-01" "2000-08-01" "2000-09-01" "2000-10-01" [11] "2000-11-01" "2000-12-01" > timeBasedSeq(2000/20000115) [1] "2000-01-01" "2000-01-02" "2000-01-03" "2000-01-04" "2000-01-05" [6] "2000-01-06" "2000-01-07" "2000-01-08" "2000-01-09" "2000-01-10" [11] "2000-01-11" "2000-01-12" "2000-01-13" "2000-01-14" "2000-01-15" > timeBasedSeq(2000/2000010110) [1] "2000-01-01 00:00:00 CST" "2000-01-01 01:00:00 CST" [3] "2000-01-01 02:00:00 CST" "2000-01-01 03:00:00 CST" [5] "2000-01-01 04:00:00 CST" "2000-01-01 05:00:00 CST" [7] "2000-01-01 06:00:00 CST" "2000-01-01 07:00:00 CST" [9] "2000-01-01 08:00:00 CST" "2000-01-01 09:00:00 CST" [11] "2000-01-01 10:00:00 CST" > Jeff Ryan wrote: > > I'm still not entirely sure I follow the desired usage, as the original > post made no reference to ggplot2, but as Gabor mentioned the yearmon etc > stuff is quite useful. > > If you are formatting arbitrary precision dates, take a look at > axTicksByTime in xts. Both xts and quantmod use it for plotting. The > core calculation is from ?endpoints > > I think the effect is what you desire --- though the logic of the function > may be more than you want/need. I use it within the package(s) to make > intelligent breaks given the periodicity of the data. > > Some examples are at: http://www.quantmod.com http://www.quantmod.com > > My presentation slides from July's Rmetrics conference in Switzerland are > posted here: http://www.quantmod.com/Rmetrics2008/ > http://www.quantmod.com/Rmetrics2008/ > > Most of the functions you have written are somewhere within xts already. > At least the functionality is. See the vignette: > http://cran.r-project.org/web/packages/xts/index.html > http://cran.r-project.org/web/packages/xts/index.html > > Jeff > > -- View this message in context: http://www.nabble.com/Truncating-dates-%28and-other-date-time-manipulations%29-tp19436962p19458976.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
