Re: Violinplot and discrete values

[Winston Chang]

You can use the "adjust" parameter, like geom_violin(adjust=2).

Since geom_violin uses (by default) stat_ydensity, you can look in ?stat_ydensity - this in turn will point you to ?density, since that's the function that does the actual calculation. 

-Winston

On Thu, Dec 6, 2012 at 8:11 AM, Raf Winand <raf.w...@gmail.com> wrote:

I'm trying to create a violin plot in R from count data. The data I use is a number of mutations that is found in each sample for each source.

It looks something like this but then for more than a thousand rows:

	mutations	names
1	6	1kG
2	6	1kG
3	6	1kG
4	6	1kG
5	6	1kG
6	6	1kG
7	6	1kG
8	6	1kG
9	5	1kG
10	5	1kG
11	5	1kG

I already use the code below to create several plots.

ggplot(df_combined, aes(factor(names), y=mutations)) + 
geom_violin() +
geom_boxplot(width=.1, outlier.size=0, fill="grey50") +
stat_summary(fun.y=median, geom="point", fill="white", shape=21, size=4) +
xlab("Source") +
ylab("Number of mutations") +
theme(axis.text = element_text(colour = "black"))`

While most of them show up just fine, some of them start to 'wobble' (best way I can explain it) Here is a link to an example that doesn't work.

I guess this is because my data is discrete and not continuous but I can't find anything on how to change this for the violin plot. Is there any way I can get this to work with ggplot2 and geom_violin?

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[Ben Bolker]

Note that this is cross-posted to StackOverflow:

http://stackoverflow.com/questions/13744979/violinplot-in-r-with-discrete-values

Cross-posting is not forbidden (although some people dislike it
because it may waste people's effort coming up with the same parallel
solutions in different places), but it is definitely polite to note that
you are cross-posting, and provide links as appropriate ...

> <http://imgur.com/0M579.jpg>

>
> I guess this is because my data is discrete and not continuous but I
> can't find anything on how to change this for the violin plot. Is
> there any way I can get this to work with ggplot2 and geom_violin?
>
> --
> You received this message because you are subscribed to the ggplot2
> mailing list.
> Please provide a reproducible example:
> https://github.com/hadley/devtools/wiki/Reproducibility
>
> To post: email ggp...@googlegroups.com

> <mailto:ggp...@googlegroups.com>
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[Raf Winand]

Thanks, that was exactly what I was looking for!