card

0th

Percentile

Cardinalities for neighbours lists

The function tallies the numbers of neighbours of regions in the neighbours list.

Keywords
spatial
Usage
card(nb)
Arguments
nb
a neighbours list object of class nb
Details

“nb” objects are stored as lists of integer vectors, where the vectors contain either the indices in the range 1:n for n as length(nb) of the neighbours of region i, or as.integer(0) to signal no neighbours. The function card(nb) is used to extract the numbers of neighbours from the “nb” object.

Value

An integer vector of the numbers of neighbours of regions in the neighbours list.

References

Bivand R, Pebesma EJ, Gomez-Rubio V, (2008) Applied Spatial Data Analysis with R, Springer, New York, pp. 239-251; Bivand R, Portnov B, (2004) Exploring spatial data analysis techniques using R: the case of observations with no neighbours. In: Anselin L, Florax R, Rey S, (eds.), Advances in Spatial Econometrics, Methodology, Tools and Applications. Berlin: Springer-Verlag, pp. 121-142.

See Also

summary.nb

Aliases
  • card
Examples
example(columbus)
table(card(col.gal.nb))
Documentation reproduced from package spdep, version 0.6-9, License: GPL (>= 2)

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