ggplot2: geom_bar with custom y limits

Question

I want to draw a bar chart with ggplot2 along with custom y limits.

Type <- LETTERS[1:5]
Y    <- c(99, 99.5, 99.0, 98.8, 98.5)

df <- data.frame(Type, Y)

The following code works fine for bar chart:

library(ggplot2)
ggplot(data = df, mapping = aes(x = Type, y = Y, fill = Type)) +
  geom_bar(stat = "identity") +
  theme_bw()

However, I'm not able to set the y limits. See the code below.

ggplot(data = df, mapping = aes(x = Type, y = Y, fill = Type)) +
  geom_bar(stat = "identity") +
  scale_y_continuous(limits = c(90, 100)) + 
  theme_bw()

ggplot(data = df, mapping = aes(x = Type, y = Y, fill = Type)) +
  geom_bar(stat = "identity") +
  ylim(90, 100) + 
  theme_bw()

Edited

I guess this behavior is due to stat = "identity".

Answer 1

Alternative, using coord_cartesian:

ggplot(data = df, mapping = aes(x = Type, y = Y, fill = Type)) +
  geom_bar(stat = "identity") +
  coord_cartesian(ylim = c(90, 100)) + 
  theme_bw()

Gives you: