将geom_point添加到ggridges

Question

如果我想向 ggridge 对象添加一个点估计，可是一直出现错误：

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

我希望实现的输出结果如下图所示:

- Hanjo Odendaal

Answer 1

问题可以通过在geom_point调用中指定inherit.aes = F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)

只会产生以下信息：

选择联合带宽为0.181

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

- missuse

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或将“fill”美学移至“stat_density_ridges”。 - Axeman