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'm not sure that this is an available option when you're colouring by a factor. However, a quick way to produce the individual plots would be something like this:

d_ply(mpg, .(manufacturer), function(df) {
jpeg(paste(df$manufacturer[[1]], ".jpeg", sep=""))
plots <- ggplot(df, aes(year, displ, color=factor(model))) + geom_jitter()
print(plots)
dev.off()
})

Related Answers: Different legends and fill colours for facetted ggplot?

Answer 2

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()