RMfractdiff is a stationary isotropic covariance model.
The corresponding covariance function only depends on the distance
r ≥ 0 between two points and is given for integers
C(r) = (-1)^r Γ(1-a/2)^2 / (Γ(1-a/2+r) Γ(1-a/2-r))
and otherwise linearly interpolated. Here -1 ≤ a < 1, Γ denotes the gamma function. It can only be used for one-dimensional random fields.
-1 ≤ a < 1
optional arguments; same meaning for any
The model is only valid for dimension d = 1 . It stems from time series modelling where the grid locations are multiples of the scale parameter.
RMfractdiff returns an object of class
Martin Schlather, [email protected]
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