subset.listw
From spdep v0.69
by Roger Bivand
Subset a spatial weights list
The function subsets a spatial weights list, retaining objects for which the subset argument vector is TRUE. At present it will only subset nongeneral weights lists (that is those created by nb2listw
with glist=NULL
).
 Keywords
 spatial
Usage
"subset"(x, subset, zero.policy = NULL, ...)
Arguments
 x
 an object of class
listw
 subset
 logical expression
 zero.policy
 default NULL, use global option value; if FALSE stop with error for any empty neighbour sets, if TRUE permit the weights list to be formed with zerolength weights vectors  passed through to
nb2listw
 ...
 generic function passthrough
Value

The function returns an object of class
listw
with component style
the same as the input object, component neighbours
a list of integer vectors containing neighbour region number ids (compacted to run from 1:number of regions in subset), and component weights
as the weights computed for neighbours
using style
.
See Also
Examples
example(columbus)
to.be.dropped < c(31, 34, 36, 39, 42, 46)
pre < nb2listw(col.gal.nb)
print(pre)
post < subset(pre, !(1:length(col.gal.nb) %in% to.be.dropped))
print(post)
Community examples
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