[R] ggplot2 barplot: extra markers in graph

[Shentu]

The reason you see the exra markers is that the first part of the command
"qplot(DT$N,DT$D,fill=factor(DT$C))" already plots the individual points.
You didn't see it with "geom_bar(stat = "identity")" simply because the
stacked bars made the previous layer invisible. To see this you can use the
ggplot function to reproduce your graph (with the points):

p<-ggplot(data=DT,aes(x=N,y=D))+geom_point()+geom_bar(stat="identity",aes(fill=factor(C)),position="dodge")

print(p)

It then becomes obvious that once you omit the geom_point(), the points are
gone. 

This is IMO a feature of the ggplot2 system, not necessarily a bug.


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