ggplot barplot in decending order

tidyverse
2

Here are three examples of graphing a simple data frame which may help you understand how the reorder function works. It orders the first argument as a function of the second argument. Also, keep in mind that you are using coord_flip, so you reorder the x axis and then it is flipped to become the y axis.

library(ggplot2)
df <- data.frame(Name = c("B", "C", "D", "A"), Number = c(4, 7, 2, 9))
df
#>   Name Number
#> 1    B      4
#> 2    C      7
#> 3    D      2
#> 4    A      9

ggplot(data = df, mapping = aes(x = Name, y = Number)) + 
  geom_bar(stat = "identity") + coord_flip()



ggplot(data = df, mapping = aes(x = reorder(Name, Number), Number)) + 
  geom_bar(stat = "identity") + coord_flip()



ggplot(data = df, mapping = aes(x = reorder(Name, -Number), Number)) + 
  geom_bar(stat = "identity") + coord_flip()

Created on 2019-05-18 by the reprex package (v0.2.1)

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