Subset a shp — redist.subset • redist

Subsets a shp object along with its adjacency. Useful for running smaller analyses on pairs of districts. Provide population, ndists, pop_tol, and sub_ndists to get proper population parity constraints on subsets.

Usage

redist.subset(shp, adj, keep_rows, total_pop, ndists, pop_tol, sub_ndists)

Arguments

shp: An sf object
adj: A zero-indexed adjacency list. Created with redist.adjacency if not supplied.
keep_rows: row numbers of precincts to keep. Random submap selected if not supplied.
total_pop: numeric vector with one entry for the population of each precinct.
ndists: integer, number of districts in whole map
pop_tol: The strength of the hard population constraint.
sub_ndists: integer, number of districts in subset map

Value

a list containing the following components:

shp: The subsetted shp object
adj: The subsetted adjacency list for shp
keep_rows: The indices of the rows kept.
sub_ndists: The number of districts in the subset.
sub_pop_tol: The new parity constraint for a subset.