How to Draw in R and Make Custom Plots
When base graphics and existing packages don’t do it for you, turn to low-level graphics functions to make what you want.
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When presented with a static graphic, it can be useful to see specific values after you see overall patterns. This tutorial shows you how to add simple interactions to a choropleth map so you can get specifics for regions.
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Filled contour plots are useful for looking at density across two dimensions and are often used to visualize geographic data. It’s straightforward to make them in R — once you get your data in the right format, that is.