Test of neighborhood list

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Description

Tests a list of neighboring regions for proper format. Neighborhood is tested for being symmetrical. Causes an error if tests fail.

Usage

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nbtest(nblist, n.regions=length(nblist))

Arguments

nblist

A list with a component for every region. The components are vectors of integers indicating neighboring regions. A region without neighbors (e.g., an island) should be assigned a vector numeric(0).

n.regions

Number of regions.

Value

invisible{TRUE}.

Author(s)

Christian Hennig chrish@stats.ucl.ac.uk http://www.homepages.ucl.ac.uk/~ucakche

See Also

prabinit.

Examples

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data(nb)
nbtest(nb)
nb[[1]][1] <- 1
try(nbtest(nb))

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