using Meshes # hide
import CairoMakie as Mke # hide
It is often useful to search neighbor elements in a domain given a point of reference. This can be performed with search methods:
NeighborSearchMethod
search
search!
searchdists
searchdists!
Search methods are constructed with various types of parameters.
One may be interested in k-nearest neighbors, or interested in
neighbors within a certain Neighborhood:
Neighborhood
MetricBall
The following example demonstrates neighbor search with the
KNearestSearch method:
grid = CartesianGrid(10, 10)
# 4-nearest neighbors
searcher = KNearestSearch(grid, 4)
inds = search(Point(5.0, 5.0), searcher)
The function search returns the indices of the elements
in the domain that are neighbors of the point. The elements are:
grid[inds]
Alternatively, the function searchdists also returns
the distances to the (centroids) of the elements:
inds, dists = searchdists(Point(5.0, 5.0), searcher)
dists
Finally, the functions search! and searchdists!
can be used in hot loops to avoid unnecessary memory allocations.
BallSearch
KNearestSearch
KBallSearch