Hi Aren, Thanks for sending the data. I poked around a bit, and here was what I came up with (a bit of a hack really, but perhaps acceptable enough). lbl_formatter looks like another way to go.
require(ggplot2) require(chron) ## hack to deal with non exported method parse.format <- chron:::parse.format ## now just use chron's format.times() function as your formatter: ggplot(dallas, aes(x = offense_time)) + geom_bar() + coord_polar() + scale_x_continuous(formatter = chron:::format.times) Somewhat sensibly, the ~22-06 hours are relatively light (at least in the little subset of your data I looked at). Note that the ::: is used because I am using functions in chron it never meant for end users to use directly. Happy graphing! Josh On Tue, Jan 3, 2012 at 6:57 PM, Aren Cambre <a...@arencambre.com> wrote: > Got it figured out. I found this post on the ggplot2 Google Group: > http://groups.google.com/group/ggplot2/browse_thread/thread/698e658b6dfec56c/5390824dab4a1cd7 > > It recommends you make this function: > lbl_formatter <- function(x) { > h <- floor(x/60) > m <- floor(x %% 60) > s <- round(60*(x %% 1)) # Round to nearest second > sprintf('%02d:%02d:%02d', h, m, s) > } > > Then you assign it as the formatter using scale_x_continuous(formatter > = lbl_formatter). > > Aren > > On Mon, Jan 2, 2012 at 9:34 PM, Aren Cambre <a...@arencambre.com> wrote: >> >> Thanks to Joshua Wiley for turning me on to ggplot2. >> >> I am making a plot using this: >> p <- ggplot(dallas, aes(x = offense_hour)) + geom_bar() + coord_polar() >> >> Dallas is a data frame, and offense_hour is a column with chron >> objects from the chron library. In this case, the chron object was >> created with the times function. It is only a time (H:M:S) with no >> date attached. >> >> The plot shows up fine, but the X axis labels are 0.0 through 1.0. How >> do I convert this to 0:00 through 23:59 (or whatever may be >> appropriate given the breaks)? >> >> My searches lead me to scale_x_discrete, but I am not clear if that's >> even the right function. >> >> Aren > > ______________________________________________ > 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. -- Joshua Wiley Ph.D. Student, Health Psychology Programmer Analyst II, Statistical Consulting Group University of California, Los Angeles https://joshuawiley.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.
