An igraph graph is named, if there is a symbolic name associated with its vertices.
- The input graph.
In igraph vertices can always be identified and specified via their numeric
vertex ids. This is, however, not always convenient, and in many cases there
exist symbolic ids that correspond to the vertices. To allow this more
flexible identification of vertices, one can assign a vertex attribute
Note that the uniqueness of vertex names are currently not enforced in igraph, you have to check that for yourself, when assigning the vertex names.
- A logical scalar.
g <- make_ring(10) is_named(g) V(g)$name <- letters[1:10] is_named(g) neighbors(g, "a")