Changing font size and direction of axes text in ggplot2

Question

I am plotting a graph with a categorical variable on the x axis and a numerical variable on the y axis.

For the x axis, given that there are many data points, the de

Answer 1

Adding to previous solutions, you can also specify the font size relative to the base_size included in themes such as theme_bw() (where base_size is 11) using the rel() function.

For example:

ggplot(mtcars, aes(disp, mpg)) +
  geom_point() +
  theme_bw() +
  theme(axis.text.x=element_text(size=rel(0.5), angle=90))