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}}
Dear Sandy, Have a look at the position argument of geom_histogram. ggplot(data=dafr, aes(x = d1, fill=d2)) + geom_histogram(binwidth = 1, position = position_dodge()) ggplot(data=dafr, aes(x = d1, fill=d2)) + geom_histogram(binwidth = 1, position = position_dodge(width = 0.5), alpha = 0.5) Best regards, Thierry ------------------------------------------------------------------------ ---- ir. Thierry Onkelinx Instituut voor natuur- en bosonderzoek team Biometrie & Kwaliteitszorg Gaverstraat 4 9500 Geraardsbergen Belgium Research Institute for Nature and Forest team Biometrics & Quality Assurance Gaverstraat 4 9500 Geraardsbergen Belgium tel. + 32 54/436 185 Thierry.Onkelinx at inbo.be www.inbo.be To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of. ~ Sir Ronald Aylmer Fisher The plural of anecdote is not data. ~ Roger Brinner The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data. ~ John Tukey> -----Oorspronkelijk bericht----- > Van: r-help-bounces at r-project.org > [mailto:r-help-bounces at r-project.org] Namens Small Sandy (NHS > Greater Glasgow & Clyde) > Verzonden: dinsdag 30 november 2010 15:37 > Aan: r-help at r-project.org > Onderwerp: [R] ggplot2 histograms > > 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(1,2,2,3,3,3,4,4,4,4,5,5,5,5,5,6,6,6,6,7,7,7,8,8,9,6,7,7,8,8,8,9,9,9,9,10,10,10,10,10,11,11,11,11,12,12,12,13,13,14,15,15,16,16,1 6,17,17,17,17,18,18,18,18,18)> > 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 at 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. >
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.small at 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 at 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/