rscatter-plot
does cex scale the radius, diameter, or area when applied to circular points in base R plots
The graphical parameter cex determines the size of various things in base R plots, from labels to point sizes. cex = 1 is the default size, cex = .5 is 50% smaller, cex = 1.5 is 50% larger. My question is what exactly cex uses to scale circular point sizes. For example, when cex = 1.5 does that mean the area, radius, or diameter of the point is 50% bigger than default?
Example of cex changing circular point size:
plot(x = 1:5, y = 1:5, type = "n")
points(x = 1:5, y = 1:5, pch = 21, cex = 1)
points(x = 1:5, y = 1:5, pch = 21, cex = 2)
Solution
It scales the radius (or, equivalently, the diameter).
plot(x = -1:1, y = -1:1, type = "n")
points(0, 0, cex = 20)
points(0, 0, cex = 40)
abline(v=0)
abline(v=0.5)
abline(v=1)
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