向ggridges添加geom_point

Question

如果我想向一个ggridge对象添加一个点估计，但是我总是得到一个错误：

library(ggplot2)
library(ggridges)

iris_med <- iris %>% group_by(Species) %>% summarise(Sepal.Length = median(Sepal.Length))

ggplot(iris, aes(x = Sepal.Length, y = Species, fill = 0.5 - abs(0.5-..ecdf..))) +
  stat_density_ridges(geom = "density_ridges_gradient", calc_ecdf = TRUE) +
  geom_point(aes(x = Sepal.Length, y = Species, color = "red"), data = iris_med)

Picking joint bandwidth of 0.181
Error in eval(expr, envir, enclos) : object 'ecdf' not found

我希望达到的产出：

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Answer 1

这个问题可以通过在inherit.aes = F调用中指定geom_point来解决：

ggplot(iris, aes(x = Sepal.Length, y = Species, fill = 0.5 - abs(0.5-..ecdf..))) +
  stat_density_ridges(geom = "density_ridges_gradient", calc_ecdf = TRUE) +
  geom_point(aes(x = Sepal.Length, y = Species, color = "red"), data = iris_med, inherit.aes = F)

只产生他以下的信息：

Picking joint bandwidth of 0.181

​

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编辑:另一种方法(感谢@Axeman的评论)是将fill美学移到stat_density_ridges层。