ggplot2: separate color scale per facet

Question

Intuitively I\'m looking for something like: facet_(scales=\"free_color\")

I do something like

p <- ggplot(mpg, aes(year, displ, colo         


        

Answer 1

I think you simply want to color by class, where each manufacturer makes several models, each only one or two per class:

p <- ggplot(mpg, aes(year, displ, color=class)) + facet_wrap(~ manufacturer)
p + geom_jitter()