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The gridGraphviz package renders node-and-edge graphs in R using the grid graphics package. Graphs are laid out using the Rgraphviz package to interface with the graph layout algorithms in graphviz. This article details the improvements made between gridGraphviz versions 0.2 and 0.3, including: support for “ellipse”- and “polygon”-shaped nodes; handling of edges in undirected graphs; support for various new arrow types; and support for edge labels. Version 0.3 also introduces a method to produce graphs with an overall size closer to graphviz’s output.
Paul Murrell and Ashley Noel Hinton
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