Order multiple variables in ggplot2

Question

I\'m attempting to group variables within variables and sort in descending order.

mydf

region  airport value
MIA         FLL 0.244587909
MIA         PBI         


        

Answer 1

@eipi10 has a great answer, but I often find myself needing to do that, plus facetting on some other variable, so there are other options as well using the forcats package:

require(dplyr)
require(forcats)

mydf %>% 
  mutate(ordering = -as.numeric(region) + value,
         airport = fct_reorder(airport, ordering, .desc = T)) %>% 
  ggplot(aes(airport, value, fill = region)) + geom_col()

Here's an example of how I might need to use both the ordering and the facets, where I add + facet_grid(~fac, scales = "free_x", space = "free_x") with another column named "fac" with my travel history: