All-pairs geodesic distance matrix (chunked)

Usage

geodesic_distance_matrix(
  geometry,
  vertices = NULL,
  targets = NULL,
  weights = NULL,
  mode = c("sparse", "dense"),
  chunk_size = 2000,
  cache = TRUE,
  cache_key = NULL,
  algorithm = c("dijkstra")
)

Arguments

geometry: SurfaceGeometry, LabeledNeuroSurface, NeuroSurface, or an igraph.
vertices: Optional integer vector of source vertices. Defaults to all vertices.
targets: Optional integer vector of target vertices. Defaults to vertices (square matrix).
weights: Optional numeric edge weights (defaults to E(g)$dist).
mode: Output mode: "sparse" (default, dgCMatrix) or "dense".
chunk_size: Number of source vertices per Dijkstra batch.
cache: Logical; cache symmetric results when targets is NULL or identical to vertices.
cache_key: Optional manual cache key.
algorithm: Only "dijkstra" is currently implemented.

Value

A distance matrix (sparse or dense) of size length(vertices) x length(targets).

Examples

geom <- example_surface_geometry()
dmat <- geodesic_distance_matrix(geom, vertices = 1:2)