R_tips_4: 二维变量的概率密度绘制

可以通过
geom_hex(aes(fill = after_stat(count)), bins = 60)

ggplot(data, aes(x = theta, y = precision)) + 
  geom_hex(aes(fill = after_stat(count)), bins = 60) + 
  scale_fill_gradient(low = "blue", high = "red")

概率密度

ggplot(data, aes(x = theta, y = precision)) + 
  geom_hex(aes(fill = after_stat(count)), bins = 60) + 
  scale_fill_gradient(low = "#00467F", high = "#A5cc82")

概率密度