ggplot2: plotting order of factors within a geom

Question

I have a (dense) dataset that consist of 5 groups, so my data.frame looks something like x,y,group. I can plot this data and colour the points based on their group using:

Answer 1

The order aesthetic is probably what you want.

library(ggplot2)
d <- ggplot(diamonds, aes(carat, price, colour = cut))
d + geom_point()
dev.new()
d + geom_point(aes(order = sample(seq_along(carat))))

The documentation is at ?aes_group_order