Change/decrease point size in GGally and ggpairs

Question

The points in ggpairs are way too big. How do I make them smaller?

Answer 1

This basically requires reading the help page and working through the examples. Turns out that there are (at least) two different sets of attributes that might affect point size. Below you will see the two that I found.

require(ggplot2)
require(GGally)
data(diamonds, package="ggplot2")
diamonds.samp <- diamonds[sample(1:dim(diamonds)[1], 200), ]

# Custom Example  ( almost directly from help page)
pm <- ggpairs(
 diamonds.samp[, 1:5],
 mapping = ggplot2::aes(color = cut),
 upper = list(continuous = wrap("density", alpha = 0.5), combo = "box"),
 lower = list(continuous = wrap("points", alpha = 0.3,    size=0.1), 
              combo = wrap("dot", alpha = 0.4,            size=0.2) ),
 title = "Diamonds"
)
 pm