[R] Weighted violin chart

[Jeff Newmiller]

Not strictly on topic on this list (ggplot2 is a contributed package) but...

ggplot(mydata, aes(x=V3, y=V1, weight=V2 )) + geom_violin(trim=FALSE)

If you want to refer to variables in the data, they have to be listed in the mapping.

On April 15, 2021 7:01:45 AM PDT, Mahmood Naderan-Tahan <mahmood.naderan using ugent.be> wrote:
>Hi again,
>
>As a follow up, does anybody know how to fix the following error?
>
>It seems that I can use a "weight" parameter in geom_violin, but I am
>able to  figure out what is the problem with the following code.
>
>
>
>> 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,
>weight=V2)
>Error in layer(data = data, mapping = mapping, stat = stat, geom =
>GeomViolin,  :
>  object 'V2' not found
>>
>>
>> wg <- as.factor(mydata$V2)
>> p <- ggplot(mydata, aes(x=V3, y=V1)) + geom_violin(trim=FALSE,
>weight=wg)
>> p + geom_dotplot(binaxis='y', stackdir='center', dotsize=1)
>`stat_bindot()` using `bins = 30`. Pick better value with `binwidth`.
>Error: Aesthetics must be either length 1 or the same as the data
>(1024): weight
>Run `rlang::last_error()` to see where the error occurred.
>
>
>
>
>
>Regards,
>Mahmood
>
>
>________________________________
>From: Mahmood Naderan-Tahan
>Sent: Monday, April 12, 2021 10:01 PM
>To: r-help using r-project.org
>Subject: Weighted violin chart
>
>
>Hi,
>
>I would like to know if it is possible to plot a weighted violin chart
>with R. Currently, I have
>
>
>> 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)
>
>I would like to use V2 as the weight vector. Any idea about that?
>
>
>
>Regards,
>Mahmood
>
>	[[alternative HTML version deleted]]
>
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-- 
Sent from my phone. Please excuse my brevity.