Understanding dnorm and geom_density

Question

x <- seq(-4, 4, length.out = 100)
data.frame(x,  f = dnorm(x)) %>%
     ggplot(aes(x, f)) +
     geom_line()

imho, this should give the exact same plot as this:

x <- seq(-4, 4, length.out = 100)
data.frame(x,  f = dnorm(x)) %>%
   ggplot() +
   geom_density(aes(x))

How come it doesn't?

Answer 1

You are probably looking for stat_function

x <- seq(-4, 4, length.out = 100)
data.frame(x,  f = dnorm(x)) %>%
     ggplot(aes(x, f)) +
     geom_line() + 
     stat_function(fun=dnorm, geom="line", col=2, lty=2)