compute_nngp_neighbors: Compute nearest neighbors for NNGP

In tulpa: Templated Unified Library for Posterior Approximation in Bayesian Hierarchical Models

Compute nearest neighbors for NNGP

Description

Compute the k nearest neighbors for each observation using Euclidean distance. Returns in a format suitable for the NNGP likelihood.

Usage

compute_nngp_neighbors(coords, k)

Arguments

coords	N x d matrix of coordinates
k	Number of nearest neighbors

Value

List with:

• nn_idx: N x k matrix of neighbor indices (0 for obs with fewer neighbors)

• nn_dist: N x k matrix of distances to neighbors

• nn_order: Ordering of observations for NNGP (by coordinate)

tulpa documentation built on Oct. 19, 2026, 5:09 p.m.