Periodic function used to compute the variance-covariance matrix of the fields of the landscape.
Usage
periodic_cov(d, range, phi = 1)
Arguments
d
a numeric object containing pairwise distances between the centroids of the fields
range
range (half-period of oscillations)
phi
amplitude of the oscillations
Value
An object of the same type as d.
Details
The periodic covariance is defined by exp(-2 * sin(d*pi/(2*range))^2 / phi^2). It is used to generate highly fragmented or highly aggregated landscapes.