How to Make a Contour Map
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.
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How to Make Variable Width Bar Charts in R
The code to create these bar chart variations is almost the same as if you were to make a standard bar chart. But make sure you get the math right.
How to Customize Axes in R
For presentation purposes, it can be useful to adjust the style of your axes and reference lines for readability. It’s all about the details.
Drawing Circles and Ellipses in R
Whether you use circles as visual encodings or as a way to highlight areas of a plot, there are functions at your disposal.