US.graph: Matrix of Shared Boundaries Between US.df Counties

Description

Description

A 475x475 matrix where the index corresponds to a row in the US.df Spatial Polygons data frame and the index of the matrix at row i column j is 1 when US.df[i,] and US.df[j,] share a border and 0 when they do not.


ar.matrix documentation built on May 1, 2019, 11:31 p.m.