Ngme bivariate model specification (theta=0) — bv_matern

Does not fit noise sd.

bv_matern_normal(
  mesh,
  sub_models,
  rho = 0,
  sd1 = 1,
  sd2 = 1,
  group = NULL,
  share_param = FALSE,
  fix_bv_theta = FALSE,
  ...
)

Arguments

mesh: mesh for build the model
sub_models: a list of sub_models (should be two matern models)
rho: the parameter related to correlation
group: group vector, can be inherited from ngme() function
share_param: TRUE if share the same parameter for 2 sub_models (of same type)
...: ignore

Value

a list of specification of model

Details

Giving 2 sub_models, build a correlated bivaraite operator based on K = D(theta, eta) $$D(\theta, \rho) = \begin{pmatrix} \cos(\theta) + \rho \sin(\theta) & -\sin(\theta) \sqrt{1+\rho^2} \\ \sin(\theta) - \rho \cos(\theta) & \cos(\theta) \sqrt{1+\rho^2} \end{pmatrix}$$