[R] ggplot2 barplot: extra markers in graph

Shentu yue_shentu at merck.com
Wed Aug 4 15:21:04 CEST 2010

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):



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

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

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