ggraph

require(ggplot);

#' A grammar of graphics for relational data
imports "ggraph" from "ggraph";

A grammar of graphics for relational data

ggraph is an extension of ggplot2 aimed at supporting relational data structures such as networks, graphs, and trees. While it builds upon the foundation of ggplot2 and its API it comes with its own self-contained set of geoms, facets, etc., as well as adding the concept of layouts to the grammar.

The core concepts

ggraph builds upon three core concepts that are quite easy To understand:

• The Layout defines how nodes are placed On the plot, that Is, it Is a conversion Of the relational Structure into an x And y value For Each node In the graph. ggraph has access To all layout functions available In igraph And furthermore provides a large selection Of its own, such As hive plots, treemaps, And circle packing.

• The Nodes are the connected entities In the relational Structure. These can be plotted Using the geom_node_*() family Of geoms. Some node geoms make more sense For certain layouts, e.g. geom_node_tile() For treemaps And icicle plots, While others are more general purpose, e.g. geom_node_point().

• The Edges are the connections between the entities In the relational Structure. These can be visualized Using the geom_edge_*() family Of geoms that contain a lot Of different edge types For different scenarios. Sometimes the edges are implied by the layout (e.g. With treemaps) And need Not be plotted, but often some sort Of line Is warranted.