Mathematical labels: label_bquote

Mix.install([
  {:giggly, path: Path.join(__DIR__, "..")},
  {:kino, "~> 0.19"}
  ])

About this notebook

This notebook follows the examples on ggplot2's reference page for label_bquote(), in the order the page gives them. Each example shows ggplot2's code first and then Giggly's. An example Giggly cannot draw yet keeps its ggplot2 code and names what it is waiting for, so the page is also a list of what remains.

label_bquote() labels a facet's rows or columns with one of R's plotmath expressions, mathematical notation in which a column written .(column) is replaced by its value in each panel. Giggly has none of it yet: Giggly.Plot.facet_grid/2 takes no labeller option, and Giggly has no labellers and no plotmath.

Expressions in the strips

alpha ^ .(vs) draws the Greek letter α raised to the power of the panel's vs, 0 or 1.

# The variables mentioned in the plotmath expression must be
# backquoted and referred to by their names.
p <- ggplot(mtcars, aes(wt, mpg)) + geom_point()
p + facet_grid(vs ~ ., labeller = label_bquote(alpha ^ .(vs)))
p + facet_grid(. ~ vs, labeller = label_bquote(cols = .(vs) ^ .(vs)))
p + facet_grid(. ~ vs + am, labeller = label_bquote(cols = .(am) ^ .(vs)))

Not in Giggly yet: facet_grid()'s labeller option, label_bquote() and R's plotmath expressions.