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How to italicize boxplot label in R using ggplot2?
Like every other tool for statistical analysis R does not display the labels of a boxplot in italics, thus if we want to do this, we need to do it manually. In ggplot2, we have a function scale_x_discrete that can be used to change the default font to italic using expression function.
Example
Consider the below data frame −
set.seed(121)
x<−sample(c("Male","Female"),5000,replace=TRUE)
y<−rnorm(5000,10,1)
df<−data.frame(x,y)
head(df,20)Output
x y 1 Female 8.543501 2 Female 11.235843 3 Female 10.619936 4 Male 11.913005 5 Female 9.454871 6 Male 11.050363 7 Male 11.345901 8 Male 9.988700 9 Male 9.470426 10 Male 9.922687 11 Male 10.563857 12 Male 10.701888 13 Female 10.433731 14 Male 9.324858 15 Female 11.511777 16 Female 8.728229 17 Male 10.363001 18 Female 11.160330 19 Male 11.342272 20 Female 10.113535
Loading ggplot2 package and creating boxplot of y for Male and Females −
Example
library(ggplot2) ggplot(df,aes(x,y))+geom_boxplot()
Output
Creating the boxplot with italic labels on X−axis −
ggplot(df,aes(x,y))+geom_boxplot()+scale_x_discrete(labels=expression(italic(Female),italic(Male)))
Output
Updated on: 17-Oct-2020
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