redist.subset: Subset a shp
In redist: Simulation Methods for Legislative Redistricting

redist.subset

R Documentation

Subset a shp

Description

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.