On Aug 4, 2010, at 7:52 AM, Dieter Vanderelst wrote:
Dear List,
(self-contained example + version info at the bottom)
I'm having trouble producing a barplot using the functions in
ggplot2. When I use the position="dodge" option, the bars are
plotted but also a number of spurious markers. More specifically, a
number of black dots are plotted in the graph that should not be
there. This behaviour is not seen when calling the same functions
without the position="dodge".
Can someone shed some light on this? How can I avoid this?
#self-contained example:
library(ggplot2)
D<-runif(30)
N<-rep(c(1:10),3)
C<-rep(c(1:3),10)
DT<-data.frame(D=D,N=N,C=C)
#works ok
qplot(DT$N,DT$D,fill=factor(DT$C))+ geom_bar(stat = "identity")
#in the resulting plot, a number of black markers are added that
should not be there
qplot(DT$N,DT$D,fill=factor(DT$C))+ geom_bar(stat = "identity",
position="dodge")
#end of example
Happens on a Mac, too (OSX 10.5.8, R 2.11.1, ggplot2 0.8.8 )
If you just want to make the dots go away, you can use:
qplot(DT$N,DT$D,fill=DT$C, geom = "bar",
stat="identity",position="dodge")
But you should probably also report it to Hadley.
version info:
Windows xp 64
R version 2.11.1 (64 bit)
ggplot2 version 0.8.8
--
David Winsemius, MD
West Hartford, CT
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