Adding quantile lines on vertical ridgelines (ggplot) similar to horizontal ridgelines-CodePudding

library(ggplot2)
library(ggridges)

ggplot(iris, aes(x = Sepal.Width, y = Species, fill = Species))  
  geom_density_ridges(scale = 1.1, quantile_lines=TRUE,
                      quantile_fun=function(x,...)mean(x))

ggplot(iris, aes(x =Species , y = Sepal.Width, fill = Species, width=..density..))  
  geom_vridgeline(stat="ydensity", scale = 1.1)

Basically, I want to add lines like this:

to this:

quantile_lines=TRUE does not work for geom_vridgeline(). I would appreciate any assistance. Thank you!

CodePudding user response：

To create horizontal ridgelines, you can use geom_density_ridges() and modify the aesthetics mapping. You can use coord_flip() function to flip the x and y axis coordinates.

Try this code:

ggplot(iris, aes(x = Sepal.Width, y = Species, fill = Species))  
  geom_density_ridges(scale = 1.1, quantile_lines=TRUE,
                      quantile_fun=function(x,...)mean(x)) 
  coord_flip()