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 called
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 <- graph.ring(10) is.named(g) V(g)$name <- letters[1:10] is.named(g) neighbors(g, "a")