Changing the Font Size in Base R Plots

Changing the Font Size in Base R Plots, To alter the font size of different elements in base R charts, use the syntax shown below:

plot(df$x, df$y, main='Title', sub='Subtitle',
     cex.main=2, #change font size of title
     cex.sub=2, #change font size of subtitle
     cex.lab=2, #change font size of axis labels
     cex.axis=2) #change font size of axis text  

The scatterplot shown below in base R can be used with this syntax by using the examples that follow:

Make a data frame

df <- data.frame(x=c(1, 2, 3, 4, 5, 6),
y=c(54, 81, 22, 36, 45, 63))
df

x  y
1 1 54
2 2 81
3 3 22
4 4 36
5 5 45
6 6 63

Create a scatterplot using the standard font sizes.

plot(df$x, df$y, main='Title', sub='Subtitle')

Example 1: Change Font Size of Title

The story title’s font size can be altered using the code below:

build a scatterplot with the title’s font size raised

plot(df$x, df$y, main='Title', sub='Subtitle', cex.main=2)

Example 2: Change Font Size of Subtitle

The plot’s subtitle can be changed by using the code provided below:

generate a scatterplot with the subtitle’s text size raised

plot(df$x, df$y, main='Title', sub='Subtitle', cex.sub=2)

Example 3: Change Font Size of Axis Labels

The plot’s axis labels’ font size can be altered using the code below:

generate a scatterplot with axis labels in larger font sizes.

plot(df$x, df$y, main='Title', sub='Subtitle',     cex.lab=2)

Example 4: Change Font Size of Axis Text

The plot’s axis text’s font size can be altered using the code below:

generate a scatterplot with the axis text’s font size raised.

plot(df$x, df$y, main='Title', sub='Subtitle', cex.axis=2)

Further Resources:-
The following tutorials provide guidance on using R:

How to Add a caption to ggplot2 Plots in R? (datasciencetut.com)

How to Label Outliers in Boxplots in ggplot2? (datasciencetut.com)

How to add labels at the end of each line in ggplot2? (datasciencetut.com)