covf_mat25ang: Matern covariance function with angular transform
In outerbase: Outer Product Regression

covf_mat25ang

R Documentation

Matern covariance function with angular transform

covf = new(covf_mat25ang)

This is the standard Matern covariance function with a power transformation which has form

c(x_1,x_2) = (1+ |h| + h^2/3) \exp(-|h|)

where

h = √{(\sin(x_1)-\sin(x_2))^2/ρ_s + (\cos(x_1)-\cos(x_2))^2/ρ_c}.

hyp is a two dimensional vector with ρ_s=exp(2*hyp[0]) and ρ_c=exp(2*hyp[1]).

no returns, this is a class which contains methods