n_subgraph {BoundaryStats}

Number of subgraphs

Description

Statistical test the for number of subgraphs, or sets of contiguous boundary elements, in the data.

Usage

n_subgraph(x, null_distrib)

Arguments

x

A SpatRaster object with boundary elements.

null_distrib

A list of probability functions output from boundary_null_distrib().

Value

The number of subgraphs in the raster and a p-value.

Author(s)

Amy Luo

References

Jacquez, G.M., Maruca,I S. & Fortin M.-J. (2000) From fields to objects: A review of geographic boundary analysis. Journal of Geographical Systems, 3, 221, 241.

Examples

data(T.cristatus)
T.cristatus <- terra::rast(T.cristatus_matrix, crs = T.cristatus_crs)
terra::ext(T.cristatus) <- T.cristatus_ext

T.crist_boundaries <- categorical_boundary(T.cristatus)
T.crist_bound_null <- boundary_null_distrib(T.cristatus, cat = TRUE, n_iterations = 100,
model = 'random_cluster')

n_subgraph(T.crist_boundaries, T.crist_bound_null)