Reordenando barras no `ggplot`

Instalando tidyverse

if (!require("tidyverse")) install.packages("tidyverse")

## Loading required package: tidyverse

## ── Attaching packages ─────────────────────────────────────── tidyverse 1.3.0 ──

## ✔ ggplot2 3.3.2     ✔ purrr   0.3.3
## ✔ tibble  3.0.0     ✔ dplyr   0.8.5
## ✔ tidyr   1.1.0     ✔ stringr 1.4.0
## ✔ readr   1.3.1     ✔ forcats 0.5.0

## ── Conflicts ────────────────────────────────────────── tidyverse_conflicts() ──
## ✖ dplyr::filter() masks stats::filter()
## ✖ dplyr::lag()    masks stats::lag()

data("mtcars")

mtcars %>% 
  rownames_to_column("cars") %>% 
  mutate(cars = fct_reorder(cars, carb)) %>% 
  ggplot(aes(cars, carb)) +
  geom_col() +
  coord_flip()