transform_parameters_spacetime: Transform Spacetime SPDE Model Parameters to Original Scale

In rSPDE: Rational Approximations of Fractional Stochastic Partial Differential Equations

Transform Spacetime SPDE Model Parameters to Original Scale

Description

This function takes a vector of transformed parameters and applies the appropriate transformations to return them in the original scale for use in spacetime SPDE models.

Usage

transform_parameters_spacetime(theta, st_model)

Arguments

theta	A numeric vector containing the transformed parameters in this order: lkappa The logarithmic representation of kappa. lsigma The logarithmic representation of sigma. lgamma The logarithmic representation of gamma. logit_rho (optional) The logit-transformed representation of rho, if drift = 1. logit_rho2 (optional) The logit-transformed representation of rho2, if drift = 1 and d = 2.
st_model	A list containing the spacetime model parameters: d The dimension (e.g., 1 or 2). bound The bound for rho and rho2. is_bounded A logical value indicating if rho and rho2 are bounded. drift A logical value indicating if drift is included in the model.

Value

A named list with the parameters in the original scale:

kappa

The original scale for kappa (exponential of lkappa).

sigma

The original scale for sigma (exponential of lsigma).

gamma

The original scale for gamma (exponential of lgamma).

rho (optional)

The original scale for rho.

rho2 (optional)

The original scale for rho2, if d = 2.

rSPDE documentation built on Jan. 26, 2026, 9:06 a.m.