Changing Title and Axis Labels in R’s GGplot Graphics

Introduction

R has powerful and aesthetic graphics capabilities. In this blog entry, you’ll learn how to add and change title and axis labels in R graphics created with ggplot.

Access Data and Libraries

Install ggplot if you have not already done so, and load ggplot2:

install.packages("ggplot")
library(ggplot2)

Now access the dataset warpbreaks:

warpbreaks
head(warpbreaks)

Standard Labels

Try the following R code:

boxplot.wool<-ggplot(warpbreaks, aes(x=wool, y=breaks)) + geom_boxplot(col="firebrick")
boxplot.wool

That’s not bad, but you might want to change the labeling. Perhaps you want to use sentence case for “wool” and “breaks.” Perhaps you also want to add a descriptor to this boxplot. Let’s try the following R code:

boxplot.wool + labs(title="Breaks by Wool Type", subtitle="From R's warpbreaks dataset", y="Breaks", x="Wool")

Here’s what you get:

That’s what you wanted.

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