How to Add a caption to ggplot2 Plots in R?

How to Add a caption to ggplot2 Plots in R?, the graphs in ggplot2 can have captions added using one of the methods listed below.

With the following data frame in R, the following examples demonstrate how to use each technique in practice.

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Let’s create a data frame

df <- data.frame(x=c(1, 2, 2, 3, 4, 5, 6, 7, 8),
y=c(23, 36, 39, 31, 32, 33, 36, 39, 23))

Now we can view the data frame

df

  x  y
1 1 23
2 2 36
3 2 39
4 3 31
5 4 32
6 5 33
7 6 36
8 7 39
9 8 23

Example 1: Add Caption in Default Location

The code that follows demonstrates how to make a scatter plot in gglot2 and insert a caption in the plot’s default place (the bottom right corner):

library(ggplot2)

Let’s create a scatter plot with a caption in the bottom left corner

ggplot(df, aes(x=x, y=y)) +
  geom_point(size=3) +
  labs(caption = "Based on 2022 Asia Cup Data")

A caption has been added to the lower right corner of the image outside the plot, as you can see.

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Example 2: Add Caption in Custom Location

The code below demonstrates how to make a scatter plot in gglot2 and add a caption to the plot’s bottom left corner.

library(ggplot2)

Now we can create a scatter plot with a caption in the default location

ggplot(df, aes(x=x, y=y)) +
  geom_point(size=3) +
  labs(caption = "Based on 2022 Asia Cup Data") +
  theme(plot.caption = element_text(hjust=0))

The lower left corner of the image outside the plot now has a caption.

Note: You can use hjust=0.5 to center the caption outside of the plot in the bottom right corner.

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Example 3: Customize Text & Add Caption

The gglot2 code below demonstrates how to make a scatter plot and add a caption with a personalized color, font size, and style.

library(ggplot2)

Let’s try to create a scatter plot with a caption in the default location

ggplot(df, aes(x=x, y=y)) +
  geom_point(size=3) +
  labs(caption = "Based on 2022 Asia Cup Data") +
  theme(plot.caption = element_text(size=16, color="red", face="italic"))

A caption with a unique color, text size, and style has been added to the bottom right corner of the image outside the plot.

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