[R] Working with violin plot

Mahmood Naderan-Tahan m@hmood@n@der@n @end|ng |rom ugent@be
Wed Mar 31 11:29:46 CEST 2021

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From: R-help <r-help-bounces using r-project.org> on behalf of Mahmood Naderan-Tahan <mahmood.naderan using ugent.be>
Sent: Wednesday, March 31, 2021 11:19:59 AM
To: r-help using r-project.org
Subject: [R] Working with violin plot


I would like to use the violin plot as described in the manual [1]. In the example, I see

ToothGrowth$dose <- as.factor(ToothGrowth$dose)

On the other hand, my data is a csv file containing some rows and numbers. Problem is that the following code doesn't work

> mydata <- read.csv('test.csv', header=T,row.names=1)
> mydata
     V1  V2   V3 V4
P1 73.6 0.7 74.6  R
P2 75.2 0.7 75.8  R
P3  6.5 0.0  7.3  R
P4 41.4 0.3 39.2  C
P5  5.4 0.1 18.2  C
P6 18.8 0.3 30.3  C
> library(ggplot2)
> p <- ggplot(ToothGrowth, aes(x=V4, y=V1)) + geom_violin()
> p
Error in FUN(X[[i]], ...) : object 'V4' not found

Any idea to fix that?

[1] http://www.sthda.com/english/wiki/ggplot2-violin-plot-quick-start-guide-r-software-and-data-visualization


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