11.17 Bar Chart Ordered X Axis


ds %>%
  count(wind_dir_9am) %>%
  ggplot(aes(x=reorder(wind_dir_9am, n), y=n)) +
  geom_col() +
  scale_y_continuous(labels=comma) +  
  labs(x=vnames["wind_dir_9am"], y="Count")

In Section 11.19 a bar chart is shown with the x axis ordered by the levels of a factor. Often we want to order the bars increasing (or decreasing) according the bar heights. In this example we simply add stats::reorder() within the aesthetics to order by the count (n in this case).

To order the bars by decreasing heights replace n with -n.

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