Colouring points by factor within the margin of a faceted ggplot2 plot in R

Question

I\'d like to create a faceted plot with margins in ggplot2. However, I\'d like the margin plot to have colours according to from which facet the particular point has been de

Answer 1

Another option would be to create the faceted plots and margin plot separately and use the gridExtra library to combine them:

library(ggplot2)
library(gridExtra)
mtcars$ALL <- "all"
p <- ggplot(mtcars, aes(mpg, wt))
p1 <- p + geom_point() + facet_grid(.~gear)
p2 <- p + geom_point(aes(color=factor(gear))) + facet_grid(.~ALL)
grid.arrange(p1, p2, ncol=2)