How to turn plot of scatter into density?

Question

I would like to know how to turn a dot dispersion graph into a dot density graph in the region, for example, where there are few dots the color of the region will be clear, where there are many dots the color of the region will be darker. Grateful!

Answer 1

Using the ggplot2 the following scatter chart:

library(ggplot2)
ggplot(faithful, aes(x = eruptions, y = waiting)) +
  geom_point() +
  xlim(0.5, 6) +
  ylim(40, 110)

You can stay like this, just changing the line geom_point:

ggplot(faithful, aes(x = eruptions, y = waiting)) +
  stat_density_2d(aes(fill = ..level..), geom = "polygon") +
  xlim(0.5, 6) +
  ylim(40, 110)

You can also do it like this:

ggplot(faithful, aes(x = eruptions, y = waiting)) +
  geom_bin2d() + 
  xlim(0.5, 6) +
  ylim(40, 110)