How to create violin plot for categories with grey color palette in reverse order using ggplot2 in R?

To create violin plot for categories with grey color palette in reverse order using ggplot2, we can follow the below steps −

• First of all, create a data frame.
• Then, create the violin plot for categories with color of violins in grey palette.
• Create the violin plot for categories with color of violins with grey palette in reverse order.

Create the data frame

Let's create a data frame as shown below −

 Live Demo

Group<-sample(c("First","Second","Third"),25,replace=TRUE)
Score<-rpois(25,10)
df<-data.frame(Group,Score)
df

On executing, the above script generates the below output(this output will vary on your system due to randomization) −

  Group Score
1 Second 10
2 Second 8
3 Second 7
4 Third  11
5 First  3
6 Second 13
7 Third  15
8 Third  7
9 Second 10
10 Second 8
11 Third 13
12 Third 10
13 First 8
14 Third 8
15 Second 14
16 First  9
17 Third  13
18 Second 10
19 First  9
20 Second 8
21 First  11
22 First  8
23 Third  5
24 Third 12
25 Third 11

Create violin plot with violins in grey color palette

Use scale_fill_grey to create the violin plot with violins in grey color palette −

Group<-sample(c("First","Second","Third"),25,replace=TRUE)
Score<-rpois(25,10)
df<-data.frame(Group,Score)
library(ggplot2)
ggplot(df,aes(Group,Score,fill=Group))+geom_violin()+scale_fill_grey()

Output

Create violin plot with violins in grey color palette in reverse order

Use scale_fill_grey to create the violin plot with violins in reverse order with grey color palette(the default value for start and end are start=0.2 and end=0.8) −

Group<-sample(c("First","Second","Third"),25,replace=TRUE)
Score<-rpois(25,10)
df<-data.frame(Group,Score)
library(ggplot2)
ggplot(df,aes(Group,Score,fill=Group))+geom_violin()+scale_fill_grey(start=0.8,end=0.
2)

Output