Use this if you are using igraph from R
A complementer graph contains all edges that were not present in the input graph.
complementer(graph, loops = FALSE)
The input graph, can be directed or undirected.
Logical constant, whether to generate loop edges.
complementer creates the complementer of a graph. Only edges
which are not present in the original graph will be included in the
complementer keeps graph and vertex attriubutes, edge
attributes are lost.
A new graph object.
Gabor Csardi email@example.com
## Complementer of a ring g <- make_ring(10) complementer(g) ## A graph and its complementer give together the full graph g <- make_ring(10) gc <- complementer(g) gu <- union(g, gc) gu graph.isomorphic(gu, make_full_graph(vcount(g)))