bv_matern: Ngme bivariate model with Matern sub_models

In ngme2: Linear Latent Non-Gaussian Models with Flexible Distributions

Ngme bivariate model with Matern sub_models

Description

Giving 2 sub_models, build a correlated bivaraite operator based on K = D(theta, eta)

D(\theta, \rho) = \begin{pmatrix} \cos(\theta) + \rho \sin(\theta) & -\sin(\theta) \sqrt{1+\rho^2} \\ \sin(\theta) - \rho \cos(\theta) & \cos(\theta) \sqrt{1+\rho^2} \end{pmatrix}

Usage

bv_matern(
  mesh,
  sub_models,
  theta = 0,
  rho = 0,
  sd1 = 1,
  sd2 = 1,
  group = NULL,
  share_param = FALSE,
  fix_theta = FALSE,
  ...
)

Arguments

mesh	the mesh where model is defined
sub_models	a list of sub_models (should be two matern models)
theta	the parameter related to rotation
rho	the parameter related to correlation
sd1	scaling parameter for the first sub-model
sd2	scaling parameter for the second sub-model
group	group vector, can be inherited from ngme() function
share_param	TRUE if share the same parameter for 2 sub_models (of same type)
fix_theta	TRUE if the rotation parameter is fixed
...	ignore

Value

a list of specification of model

ngme2 documentation built on May 20, 2026, 9:10 a.m.