[R] superpose violin and boxplot in ggplot

[PIKAL Petr]

Hi

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Ben Bolker
> Sent: Wednesday, September 11, 2013 3:46 PM
> To: r-help at stat.math.ethz.ch
> Subject: Re: [R] superpose violin and boxplot in ggplot
> 
> PIKAL Petr <petr.pikal <at> precheza.cz> writes:
> 
> >
> > Dear all
> >
> > I am struggling a bit with tricky violinplot. I found how to
> superpose
> boxplots correctly to violinplots.
> >
> > p<-ggplot(Cars93, aes(x=Origin, y=Price, fill=Type, colour=Type))
> 
>  [snip]
> >
> > How I could change colour of boxplots to single colour but get the
> > boxes at the correct locations e.g. over violins.
> >
> > Thanks
> > Petr
> >
> >
> 
> Use the group() aesthetic:
> 
> p+geom_violin()+
> p+geom_boxplot(aes(fill=NULL,group=interaction(Type,Origin)),
>    position=position_dodge(width=.9), width=.5, colour="black")

Thanks. In the meantime I found another solution using scale_colour_manual.

p+geom_violin()+geom_boxplot(aes(fill=NULL),
position=position_dodge(width=.9), width=.5)+scale_colour_manual(values=rep("black", 6))

Your solution seems to be better as the legend looks slightly better.

> 
> By the way, it would be useful to remind us that Cars93 is available in
> the MASS package -- I had to hunt around a little bit.

Sorry for that. I forgot to add it to my question together with ggplot2 package.

Regards
Petr



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