How can I sort my y result when using geom_col()?

Question

I have two plots:

1.

ggplot() + geom_col(data = descritivasseries,
                    aes(x = streaming, y = media_IMDB),
                    fill = "seagreen1") + 
  coord_cartesian(ylim = c(6.85, 7.20)) +
  labs(title = "Avaliação das Séries",
       x = "", y = "Média das Notas IMDb")

ggplot() + geom_col(data = descritivasfilmes,
                    aes(x = streaming, y = media_IMDB),
                    fill  = "deepskyblue") +
  labs(title = "Avaliação dos Filmes", x = "", y = "Média das Notas IMDb") +
  coord_cartesian(ylim = c(5.85, 6.6))

The first one looks like this:

And the second one looks like this:

I would like both of their y results to be organized in ascending order. How would I do that?

Answer 1

You can reorder factors within a ggplot() command using fct_reorder() from the forcats package.

library(ggplot2)
library(forcats)

df <- data.frame(
  streaming = c("Disney", "Hulu", "Netflix", "Prime Video"), 
  score = c(4, 2, 3, 1)
)

# no forcats::fct_reorder()
ggplot(df, aes(x = streaming, y = score)) +
         geom_col()

# with forcats::fct_reorder()
ggplot(df, aes(x = forcats::fct_reorder(streaming, score), y = score)) +
         geom_col()

^{Created on 2021-11-18 by the reprex package (v2.0.1)}

To reverse the order, run

ggplot(df, aes(x = forcats::fct_reorder(streaming, desc(score)), y = score)) +
         geom_col()