pub fn node_boundary(
graph: &Graph,
nbunch: &[&str],
nbunch2: Option<&[&str]>,
) -> Vec<String>Expand description
Return the set of nodes on the boundary of nbunch.
The node boundary is the set of nodes outside nbunch that have
a neighbor in nbunch. If nbunch2 is given, only nodes in nbunch2
are considered for the boundary.