ggplot2 add a legend for several stat_functions

Question

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")

kohske · Accepted Answer · 2012-04-10 09:14:56Z

18

Try this:

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"))

enter image description here

answered Apr 10, 2012 at 9:14

kohske

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1 Comment

Aditya Sharma Over a year ago

How to add a continuous color scale to this?

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