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Boundary of a set of points in 2-D or 3-D

`k = boundary(x,y)`

`k = boundary(x,y,z)`

`k = boundary(P)`

`k = boundary(___,s)`

```
[k,v] =
boundary(___)
```

`alphaShape`

| `convhull`

| `delaunayTriangulation`

| `triangulation`

| `trisurf`

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