nodes_by_edges_matrix {chessboard} | R Documentation |
Create a nodes-by-edges matrix
Description
Creates a nodes-by-edges matrix that will be used by aem()
of the package
adespatial
. This function creates the same output as aem.build.binary()
of the package adespatial
but works in a different way: it's only based on
node labels (not on coordinates). Also, this function adds labels to nodes
and edges.
Usage
nodes_by_edges_matrix(edges)
Arguments
edges |
a |
Value
A list of two elements:
-
se.mat
: the nodes-by-edges matrix of dimensionsn x k
, wheren
is the number of nodes andk
the number of edges (including the edge between the fictitious origin and the first site); -
edges
: adata.frame
of edge list.
Examples
library("chessboard")
# Two-dimensional sampling ----
sites_infos <- expand.grid("transect" = 1:3, "quadrat" = 1:5)
sites_infos
nodes <- create_node_labels(data = sites_infos,
transect = "transect",
quadrat = "quadrat")
edges <- create_edge_list(nodes, method = "pawn", directed = TRUE)
# Create nodes-by-edges matrix ----
nodes_by_edges_matrix(edges)
[Package chessboard version 0.1 Index]