subtract_edge

Subtract Edges from an Adjacency List

A compilation of tools to complete common tasks for studying gerrymandering.
This focuses on the geographic tool side of common problems, such as linking
different levels of spatial units or estimating how to break up units. Functions
exist for creating redistricting-focused data for the US.

Christopher T. Kenny

geomander

Geographic Tools for Studying Gerrymandering

Cory McCartan

subtract_edge function

<dl><dt>adj</dt>
<dd>list of adjacent precincts</dd>
<dt>v1</dt>
<dd>vector of vertex identifiers for the first vertex. Can be an
integer index or a value to look up in <code>ids</code>, if that argument is provided.
If more than one identifier is present, disconnects each to corresponding
entry in v2, if an edge exists.</dd>
<dt>v2</dt>
<dd>vector of vertex identifiers for the second vertex. Can be an
integer index or a value to look up in <code>ids</code>, if that argument is provided.
If more than one identifier is present, disconnects each to corresponding
entry in v2, if an edge exists.</dd>
<dt>ids</dt>
<dd>A vector of identifiers which is used to look up the row indices
for the vertices. If provided, the entries in <code>v1</code> and <code>v2</code> must match
exactly one entry in <code>ids</code>.</dd>
<dt>zero</dt>
<dd>boolean, TRUE if <code>adj</code> is zero indexed. False if one indexed.</dd></dl>

Arguments

Subtract Edges from an Adjacency List — subtract_edge

<dl>

<dt>adj</dt>
<dd>list of adjacent precincts</dd>


<dt>v1</dt>
<dd>vector of vertex identifiers for the first vertex. Can be an
integer index or a value to look up in <code>ids</code>, if that argument is provided.
If more than one identifier is present, disconnects each to corresponding
entry in v2, if an edge exists.</dd>


<dt>v2</dt>
<dd>vector of vertex identifiers for the second vertex. Can be an
integer index or a value to look up in <code>ids</code>, if that argument is provided.
If more than one identifier is present, disconnects each to corresponding
entry in v2, if an edge exists.</dd>


<dt>ids</dt>
<dd>A vector of identifiers which is used to look up the row indices
for the vertices. If provided, the entries in <code>v1</code> and <code>v2</code> must match
exactly one entry in <code>ids</code>.</dd>


<dt>zero</dt>
<dd>boolean, TRUE if <code>adj</code> is zero indexed. False if one indexed.</dd>

</dl>

subtract_edge: Subtract Edges from an Adjacency List

Description

Usage

Value

Arguments

Examples