How can I add a subtitle and change the font size of ggplot plots in R?

Question

I tried adding a subtitle using +opts(subtitle=\"text\") but nothing showed up. The main title does work (+opts(title=\"text\")).

I would also

Answer 1

theme_get() will show you the "hidden" options that you can use in opts(), post 0.91 it's theme()

Current:

theme(axis.text.x=element_text(size=X))
theme(axis.text.y=element_text(size=X))

Pre 0.91:

opts(axis.text.x=theme_text(size=X))
opts(axis.text.y=theme_text(size=X))

Change size, to your desired size.

wrt the title, you can use "\n" to move the remaining text to a new line:

Current:

labs(title="text \n more text")

Pre 0.91:

opts(title="text \n more text") 

ggplot2 doesn't have "subtitle" functionality. But you can use the \n term in any of the labels to drop down a line.