dci: Directional connectivity matrix

In jsta/dciR: Calculate Directional Connectivity Index without Matlab

Description

Directional connectivity matrix

Usage

dci(mat, xgrain, ygrain)

Arguments

mat	matrix 2D matrix of zeros and ones, in which ones represent the landscape patch of interest. The axis of interest along which directional connectivity is computed is dimension 1 of this matrix.
xgrain	pixel length in cm (i.e., along dimension 1 of the variable "state")
ygrain	pixel width in cm (i.e., along dimension 2 of the variable "state")

Details

This function first converts a binary image to an adjacency matrix (larsen::im2adjacency). Next, this matrix is fed into a modified version of DCIu (DCIu_aont). DCIu_aont calls an underlying distance function in the process of returning a DCI value. The distance function (dijkstra_edit) requires requires an adjacency list which is created with the adj2adjL function.

Examples

## Not run: 
mat <- matrix(c(0,0,1,0,0,0,1,0,1,0,0,1,0,0,1,0,0,0,1,0,1,1,0,0,0),nrow=5,byrow=TRUE)
mat<-matrix(c(1,1,1,0,0,0,0,0,0,0,0,0,1,1,1,0,0,0,0,0,1,1,1,0,0),nrow=5,byrow=TRUE)
xgrain<-1
ygrain<-1
dci(mat,xgrain,ygrain)

## End(Not run)

jsta/dciR documentation built on May 20, 2019, 2:10 a.m.