You may find it easier to use a frequency polygon, geom = "freqpoly".
Hadley On Tue, Nov 30, 2010 at 2:36 PM, Small Sandy (NHS Greater Glasgow & Clyde) <sandy.sm...@nhs.net> wrote: > Hi > > With ggplot2 I can very easily create beautiful histograms but I would like > to put two histograms on the same plot. The histograms may be over-lapping. > When they are overlapping the bars are shown on top of each other (so that > the overall height is the sum of the two). Is there any way to get them to > display overlapping (with smaller value in front, larger value behind) so > that the overall height is equal to the height of the largest value > > The following demonstrates the problem (there is probably a simple way to > generate the sequence in d1 but I don't know it and just threw this together > quickly) > d1<-c(1,2,2,3,3,3,4,4,4,4,5,5,5,5,5,6,6,6,6,7,7,7,8,8,9,6,7,7,8,8,8,9,9,9,9,10,10,10,10,10,11,11,11,11,12,12,12,13,13,14,15,15,16,16,16,17,17,17,17,18,18,18,18,18) > > d2<-c(rep("a",25), rep("b",39)) > dafr<-data.frame(d1,d2) > > library(ggplot) > qplot(d1, data=dafr, fill=d2, geom='histogram', binwidth = 1) > > Many thanks for any help > Sandy > > Sandy Small > Clinical Physicist > NHS Forth Valley > and > NHS Greater Glasgow and Clyde > > > ******************************************************************************************************************** > > This message may contain confidential information. If yo...{{dropped:24}} > > ______________________________________________ > 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. > -- Assistant Professor / Dobelman Family Junior Chair Department of Statistics / Rice University http://had.co.nz/ ______________________________________________ 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.