I have a scatterplot of mtcars and I was wondering if there is way to specify the color of the points corresponding to the maximum and minimum mpg values. I guess a broader way to ask the question would be is there a way to assign point color based on subgroups, ie 3 most efficient cars in green and 3 least efficient cars in red?
plot(mpg~hp, col= "red", data= mtcars)
thank you!
You need to pass in a vector of colors. As soon as you know which one is min/max, this is pretty straightforward. Also notice how formula works. You should not be specifying the data.frame.
with(mtcars, ifelse(mpg %in% c(min(mpg), max(mpg)), yes = "red", no = "black"))
# used directly in plot() because we specified data = mtcars
plot(mpg ~ hp, col = ifelse(mpg %in% c(min(mpg), max(mpg)), "red", "black"), data = mtcars)
