SpatEntropy (version 0.1.0)

adj_list: Adjacency list for spatial entropy.

Description

adj_list builds a list of adjacency matrices for the computation of Altieri's entropy, one for each possible distance range within the observation area.

Usage

adj_list(dist.mat, dist.breaks)

Arguments

dist.mat

An upper-triangular matrix of Euclidean distances, as returned by euclid_dist().

dist.breaks

A numeric vector with the breaks for the partition of the maximum distance into distance classes. It must start at 0 and end at the maximum possible distance within the observation area.

Value

A list of length length(dist.breaks)-1; each element is an upper-triangular adjacency matrix as returned by adj_mat() according to the corresponding distance range.

Details

This function is needed for the computation of Altieri's spatial entropy. After defining the distance classes in which the observation window has to be partitioned, for each class ad adjacency matrix is constructed. Each adjacency matrix identifies what pairs of points/areas fall within the specific distance range is the basis for the computation of the local term of Altieri's spatial entropy.

Examples

# NOT RUN {
dist.breaks=c(0,1,2,5,10*sqrt(2))
dist.mat=euclid_dist(coords_pix(square(10), nrow=10, ncol=10))
my.adj.list=adj_list(dist.mat, dist.breaks)

# }