freeBoundary — Return boundary edges for a DelaunayTri triangulation.
freeBoundary(dt) returns an M-by-2 one-based edge list for edges used by only one triangle in a 2-D DelaunayTri object.
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 freeBoundary works
- Accepts
DelaunayTriobjects from the legacy constructor. - MATLAB-compatible object connectivity uses double storage; manually supplied typed-integer connectivity is available in
runmatcompatibility mode. - Returns one-based vertex indices sorted deterministically by edge.
- Returns a 0-by-2 tensor for empty triangulations.
Example
Find outer edges
dt = DelaunayTri([0 0; 1 0; 0 1]);
e = freeBoundary(dt);Using freeBoundary with coding agents
Open a RunMat example with live inputs, then ask the agent to explain how freeBoundary changes the result.
Run a small freeBoundary 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 freeBoundary is executed, line by line, in Rust.
- View the source for freeBoundary 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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