## 11.30 Labels with Comma

20200428

ds %>%
ggplot(aes(wind_dir_9am, fill=wind_dir_9am)) +
geom_bar() +
scale_y_continuous(labels=comma) +
theme(legend.position="none") +
labs(x=vnames["wind_dir_9am"], y="Count")

With ggplot2 Version 0.9.0 the package introduced a mechanism to handle many of the scale operations, in such a way as to support base and lattice graphics, as well as graphics. Scale operations include position guides, as in the axes, and aesthetic guides, as in the legend.

The function scales::comma() is useful for presenting numbers using commas to separate the thousands. This is always a good idea as it assists the reader in quickly determining the magnitude of the numbers we are looking at. As a matter of course, I recommend commas in plots (and tables) at all times. To do so use the ggplot2::scale_continuous() function with labels=comma.

### References

Wickham, Hadley, Winston Chang, Lionel Henry, Thomas Lin Pedersen, Kohske Takahashi, Claus Wilke, Kara Woo, Hiroaki Yutani, and Dewey Dunnington. 2020. Ggplot2: Create Elegant Data Visualisations Using the Grammar of Graphics. https://CRAN.R-project.org/package=ggplot2.

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