Periodic covariance function

Periodic function used to compute the variance-covariance matrix of the fields of the landscape.

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.

See also

multiN

Examples

periodic_cov(10, range = 5)
#> [1] 1