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
freeBoundary(dt)How freeBoundary works
- Accepts
DelaunayTriobjects from the legacy constructor. - 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.
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