ggplot2 multiline title, different indentations

Question

I am generating graphs for a publication and I\'d like to be able to label the panels of a figure in ggplot itself (as opposed to exporting to publisher, etc) so that they j

Answer 1

Update: Since ggplot2 3.0.0 there is now native support for plot labels, see this answer.

Here is how I would do it, using the cowplot package that I wrote specifically for this purpose. Note that you get a clean theme as a bonus.

library(cowplot)

p <- ggplot(iris, aes(x = Sepal.Length, y = Sepal.Width, color = Species, shape = Species)) +
  geom_jitter(size = 3.5) +
  ggtitle("The Actual Long, Normal Title of Titliness")

# add one label to one plot
ggdraw(p) + draw_plot_label("A")

# place multiple plots into a grid, with labels
plot_grid(p, p, p, p, labels = "AUTO")

You then want to use the save_plot function to save plots instead of ggsave, because save_plot has defaults and parameters that help you get the scaling right relative to the theme, in particular for plots in a grid.