CODEWITHSUNDEEP
rggplot2
kittygirl
kittygirl

Reputation: 2443

y axis breaks doesn't work when ggplot `geom_density_ridges`

iris %>% 
  mutate(Species=as.integer(Species)) %>% 
ggplot(aes(x = Sepal.Length, y = Species, group = Species)) + 
  geom_density_ridges()

Above script works well and output as below:
enter image description here

But when I add breaks to y axis, the breaks disappear. 

iris %>% 
  mutate(Species=as.integer(Species)) %>% 
ggplot(aes(x = Sepal.Length, y = Species, group = Species)) + 
  scale_y_discrete(limit=c(0,30),breaks = seq(0,30,1))+
  geom_density_ridges()

enter image description here

Where is the problem?

Upvotes: 0

Views: 322

Answers (1)

user13653858
user13653858

Reputation:

If you have a (continuous) numeric y axis, you need to use scale_y_continuous() (which takes number breaks) rather than scale_y_discrete() (which takes a character vector of breaks). I'll use your example, however, it doesn't make much sense to me as you're converting Species to integers...:

# working nonsense
iris %>% 
    mutate(Species=as.integer(Species)) %>% 
    ggplot(aes(x = Sepal.Length, y = Species, group = Species)) + 
    scale_y_continuous(limit=c(0,30),breaks = seq(0,30,1))+
    geom_density_ridges()

This works as you probably want (integer breaks are displayed), but, as I say, it seems to be a nonsense.

geom_density_ridges() is used rather for displaying multiple density plots with categorical data on y axis, like this:

iris %>% 
    ggplot(aes(x = Sepal.Length, y = Species)) + 
    geom_density_ridges()

Upvotes: 1

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