ggplot2 : Color One Category Separately

Question

I\'m generating a scatterplot in which one of my categories is an \"Other\" category. I would like the other categories in my factor variable to be whatever color they are,

Answer 1

based on this post you can get ggplot colors with this function:

gg_color_hue <- function(n) {
  hues = seq(15, 375, length = n + 1)
  hcl(h = hues, l = 65, c = 100)[1:n]
}

So in your case :

cols = gg_color_hue(length(levels(iris$Species)))

Then you reprogramm the color you want to change and use it for your plot:

cols[levels(iris$Species)=="virginica"]="gray"
p2 <- p1 + scale_color_manual(values=cols)