[igraph] Merge 2 Graphs with all vertices and edges or add edges to a graph an connect randomly

[Kai Pohl]

Hello!

Maybe somebody can help us with our current iGraph project.

In this project is a network to be expanded. By 5%, 10% and so on. How can we add randomly vertices and edges to an existing network in R, iGraph?

Another idea was to create a random network (e.g. "erdos.renyi.game(20,  .8)") and to merge the existing network and the random network. We used "graph.union" but only the edges were merged, not the vertices.

We are appreciate for any help, thanks.

Best regards

Kai Pohl