What is the corresponding rule of ggplot2 multi-dimensional facet and multi-layer

Today, I will introduce to you what the corresponding rules of ggplot2 multi-dimensional facet and multi-layer are. The content of the article is good. Now I would like to share it with you. Friends who feel in need can understand it. I hope it will be helpful to you. Let's read it along with the editor's ideas.

Today, I will only tell you one knowledge point, which is how facets correspond to multi-layer relations in the high-level usage of ggplot2. This usage has bothered me for a long time, and it was only recently that I found this loophole when I helped my friends to do things, so I felt to share it with you.

The multi-dimensional facet system of ggplot2 is very perfect, which makes it very convenient for us to matrix a multi-dimensional complex graph according to the category of a certain dimension, so that the information of a single category is more clear and the data is intuitive and easy to understand.

Usually we can make a facet map based on geographical location by following these steps.

Library (ggplot2)

Library (plyr)

Library (maptools)

Library (Cairo)

Library (RColorBrewer)

Library (dplyr)

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