| card {spdep} | R Documentation |
Cardinalities for neighbours lists
Description
The function tallies the numbers of neighbours of regions in the neighbours list.
Usage
card(nb)
Arguments
nb |
a neighbours list object of class |
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.
Author(s)
Roger Bivand Roger.Bivand@nhh.no
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
Examples
col.gal.nb <- read.gal(system.file("weights/columbus.gal", package="spData")[1])
table(card(col.gal.nb))