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

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I keep wanting to do this, but plotmatrix is crap. Hadley recommends using the GGally package instead. It has a function, ggpairs that is a vastly improved pairs plot (lets you use non-continuous variables in your data frames). It plots different plots in each square, depending on the variable types:

library(GGally)
ggpairs(iris, aes(colour = Species, alpha = 0.4))

enter image description here

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