Delete Neighborhood Relations
Adds the neighborhhod relationship between two given regions from a map object in graph format.
delete.neighbor(map, region1, region2)
map object in graph format that should be modified.
names of the regions that should no longer be regarded as neighbors.
Returns an adjacency matrix that represents the neighborhood structure of
map minus the
deleted neighborhood relation in graph format.
Felix Heinzl, Thomas Kneib.
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