nearestNeighbor — Find nearest DelaunayTri vertices for query points.
nearestNeighbor(dt, q) returns one-based indices of the nearest triangulation vertices for an N-by-2 query matrix. nearestNeighbor(dt, x, y) accepts coordinate vectors.
Syntax
out = helper(dt, varargin)Inputs
| Name | Type | Required | Default | Description |
|---|---|---|---|---|
dt | Any | Yes | — | DelaunayTri object. |
varargin | Any | Variadic | — | Query point matrix or coordinate vectors. |
Returns
| Name | Type | Description |
|---|---|---|
out | NumericArray | Numeric result. |
Errors
| Identifier | When | Message |
|---|---|---|
RunMat:DelaunayTri:InvalidArgument | Constructor, object, constraint, or query inputs are malformed. | DelaunayTri: invalid argument |
RunMat:DelaunayTri:Unsupported | The legacy class is used with constrained or 3-D triangulation forms that RunMat does not implement yet. | DelaunayTri: unsupported form |
How nearestNeighbor works
- Accepts query matrices or paired coordinate vectors.
- MATLAB-compatible object and query coordinates use double storage; typed-integer coordinates are available in
runmatcompatibility mode. - Returns an N-by-1 tensor of one-based vertex indices.
- Returns NaN for queries against an empty point set.
Example
Find nearest vertices
dt = DelaunayTri([0 0; 1 0; 0 1]);
idx = nearestNeighbor(dt, [0.2 0.1; 0.8 0.1]);Using nearestNeighbor with coding agents
Open a RunMat example with live inputs, then ask the agent to explain how nearestNeighbor changes the result.
Run a small nearestNeighbor example, explain the result, then change one input and compare the output.
Related Geometry functions
Open-source implementation
Unlike proprietary runtimes, every RunMat function is open-source. Read exactly how nearestNeighbor is executed, line by line, in Rust.
- View the source for nearestNeighbor in Rust on GitHub
- Learn how the RunMat runtime works
- Found a bug? Open an issue with a minimal reproduction.
About RunMat
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