A planar graph is a graph that can be drawn (or embedded) in the plane so that no edges cross. Maps naturally correspond to planar graphs. Below is an edge list of the regions of Ghana. Two regions appear on
igraph is a package for handling graphs networks. It has versions in C, Python, and R. Below are some useful commands for manipulating graphs using it. library(‘igraph’) # Read the graph from Mark Newman’s website. The graph is in GraphML
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