ngme Matern SPDE model specification
Usage
matern(
mesh = NULL,
alpha = 2,
fix_alpha = TRUE,
kappa = NULL,
theta_kappa = NULL,
rational_order = 2,
B_kappa = NULL
)Arguments
- mesh
an fmesher::fm_mesh_2d object, mesh for build the SPDE model
- alpha
SPDE smoothness parameter (alpha = 2beta) 2 or 4 for integer case, otherwise for fractional case
- fix_alpha
if FALSE, enable fractional modeling
- kappa
the range parameter, for the stationary model, it is the range parameter
- theta_kappa
kappa = exp(B_kappa * theta_kappa), for the non-stationary model, it is the range parameter
- rational_order
order of rational approximation for fractional operators (default: 2)
- B_kappa
bases for theta_kappa, ignore if use the stationary model