Adding an extra point in a ggplot2 graph

Question

I have created a plot of the Sepal.Length and the Sepal.Width (using the iris dataset) with ggplot2.

  ggplot(iris, aes(x = Sepal.Width, y = Sepal.Length, col =          


        

Answer 1

Add another layer:

ggplot(iris, aes(x = Sepal.Width, y = Sepal.Length, col = Species)) + 
  geom_point() +
  geom_point(aes(x=5.6, y=3.9), colour="blue")