ggplot2 add a legend for several stat_functions
I see a lot of questions regarding how to customize legends, but I can't even get a legend to customize. I would like to have a legend explaining that the black line is quadratic and that the green line is cubic.
library(ggplot2) myfun1 <- function(x) x^2 myfun2 <- function(x) x^3 myplot <- ggplot(data = data.frame(x = 1:5, y= 1:5), aes(x=x, y=y)) + stat_function(fun = myfun1, color="green") + stat_function(fun = myfun2, color="black")
ggplot(NULL, aes(x=x, colour = g)) + stat_function(data = data.frame(x = 1:5, g = factor(1)), fun = myfun1) + stat_function(data = data.frame(x = 1:5, g = factor(2)), fun = myfun2) + scale_colour_manual(values = c("red", "green"), labels = c("quadratic", "cubic"))