• Parameters

    • graph: FOLD

      a FOLD object

    Returns number[]

    unsorted list of vertex indices which lie along the boundary.

    Description

    A vertex is a boundary vertex if it is a member of a boundary edge, as defined by edges_assignment. If edges_assignment is not present, or does not contain boundary edges, this will return an empty array. If you need sorted vertices, use the boundary() or boundaries() method.