geom_edges

Links neighbors (cells) on a chessboard plotted with <code>gg_chessboard()</code>.

Provides functions to work with directed (asymmetric) and
undirected (symmetric) spatial networks. It makes the creation of
connectivity matrices easier, i.e. a binary matrix of dimension n x n, where
n is the number of nodes (sampling units) indicating the presence (1) or
the absence (0) of an edge (link) between pairs of nodes. Different network
objects can be produced by 'chessboard': node list, neighbor list, edge
list, connectivity matrix. It can also produce objects that will be used
later in Moran's Eigenvector Maps (Dray et al. (2006) <doi:10.1016/j.ecolmodel.2006.02.015>)
and Asymetric Eigenvector Maps (Blanchet et al. (2008) <doi:10.1016/j.ecolmodel.2008.04.001>),
methods available in the package 'adespatial' (Dray et al. (2023)
<https://CRAN.R-project.org/package=adespatial>). This work is part of the
FRB-CESAB working group Bridge
<https://www.fondationbiodiversite.fr/en/the-frb-in-action/programs-and-projects/le-cesab/bridge/>.

Nicolas Casajus

chessboard

Create Network Connections Based on Chess Moves

Erica Rievrs Borges

Eric Tabacchi

Guillaume Fried

Nicolas Mouquet

geom_edges function

<dl><dt>nodes</dt>
<dd>a <code>data.frame</code> with (at least) the following three columns:
<code>node</code>, <code>transect</code>, and <code>quadrats</code>. Must be the output if the function
<code>create_node_labels()</code>.</dd>
<dt>focus</dt>
<dd>an <code>character</code> of length 1. The node label to be emphasized on
the chessboard. Must exist in the <code>nodes</code> object.</dd>
<dt>neighbors</dt>
<dd>a <code>data.frame</code> with the following at least three columns:
<code>node</code>, <code>transect</code>, and <code>quadrats</code>. See <code>pawn()</code>, <code>fool()</code>, etc. for
further information.</dd></dl>

Arguments

Link neighbors by arrow on a chessboard — geom_edges

<dl>

<dt>nodes</dt>
<dd>a <code>data.frame</code> with (at least) the following three columns:
<code>node</code>, <code>transect</code>, and <code>quadrats</code>. Must be the output if the function
<code>create_node_labels()</code>.</dd>


<dt>focus</dt>
<dd>an <code>character</code> of length 1. The node label to be emphasized on
the chessboard. Must exist in the <code>nodes</code> object.</dd>


<dt>neighbors</dt>
<dd>a <code>data.frame</code> with the following at least three columns:
<code>node</code>, <code>transect</code>, and <code>quadrats</code>. See <code>pawn()</code>, <code>fool()</code>, etc. for
further information.</dd>

</dl>

geom_edges: Link neighbors by arrow on a chessboard

Description

Usage

Value

Arguments

Examples