Using "weight" in violin chart

[Mahmood Naderan]

Hi

I tried to use "weight" parameter to plot a weighted violin chart. However, in the following code, there is not difference between having "weight=V2" and not having that.

> library(ggplot2)

> mydata <- read.csv('test.csv', header=T,row.names=1)
> mydata
     V1 V2 V3
P1 73.6 50  R
P2 75.2 20  R
P3  6.5  5  R
P4 41.4 10  C
P5  5.4 10  C
P6 18.8  5  C
> p <- ggplot(mydata, aes(x=V3, y=V1)) + geom_violin(trim=FALSE)
> p + geom_dotplot(binaxis='y', stackdir='center', dotsize=1)
`stat_bindot()` using `bins = 30`. Pick better value with `binwidth`.
> p <- ggplot(mydata, aes(x=V3, y=V1), weight=V2) + geom_violin(trim=FALSE)
> p + geom_dotplot(binaxis='y', stackdir='center', dotsize=1)
`stat_bindot()` using `bins = 30`. Pick better value with `binwidth`.

Did I miss something? It seems that "weight" has no effect.

Regards,

Mahmood

[Oscar de Lama]

Hi Mahmood.

 You have to put the weight setting inside the call to `aes(...., weight=V2)`. This is because, with aes(), you map aesthetics with data variables like V2. It should raise an error for your code, like when you put `color=V2` outside of aes. Weirdly enough, it doesn't. I think that is a bug.

Cheers,

Oscar

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[Mahmood Naderan]

Hi Oscar,

Thanks for that. You are right.

Regards,
Mahmood

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