adlaplaceFem

Finite-element approximations for hierarchical models with adlaplace. Currently focuses on tensor-product B-spline FEM ingredients for Matérn Gaussian random fields; additional FEM approximations will live here.

Features

• fem_bspline() — design matrix A and Grams C, G, G2 (and G3 for degree ≥ 3)
• fem_precision() / fem_precision_payload() — assemble Q₂/Q₃ and chol pattern for random_fem_ssq_* / random_fem_det_*
• matern() — formula term for 2D Matérn GRFs via FEM
• Optional terra SpatRaster / SpatVector coords (Suggests only)

Vignettes

• fem_matern_methods — SPDE/FEM mathematics and Matérn vs FEM covariance comparison
• fem_joint_density — joint density / gradient / Hessian via adlaplace (no optimization)
• loaloa — prevalence example with FEM Matérn