graph.compose: Compose two graphs as binary relations
In igraph: Network Analysis and Visualization

graph.compose

R Documentation

Compose two graphs as binary relations

graph.compose() was renamed to compose() to create a more consistent API.

graph.compose(g1, g2, byname = "auto")

`g1`	The first input graph.
`g2`	The second input graph.
`byname`	A logical scalar, or the character scalar `auto`. Whether to perform the operation based on symbolic vertex names. If it is `auto`, that means `TRUE` if both graphs are named and `FALSE` otherwise. A warning is generated if `auto` and one graph, but not both graphs are named.