| US.graph {ar.matrix} | R Documentation |
Matrix of Shared Boundaries Between US.df Counties
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.
[Package ar.matrix version 0.1.0 Index]