Create a matrix of scatterplots (pairs() equivalent) in ggplot2

Question

Is it possible to plot a matrix of scatter plots with ggplot2, using ggplot's nice features like mapping additional factors to color, shape etc. and adding smoother?

I am thinking about something similar to the base function pairs.

Answer 1

To create a matrix of scatterplots, you can use the ggpairs() function from the GGally package as follows:

install.packages("GGally")

library(GGally)

data(iris)

ggpairs(iris[,1:3])

Output: