Use this if you are using igraph from R
| make_empty_graph {igraph} | R Documentation | 
A graph with no edges
make_empty_graph(n = 0, directed = TRUE)
empty_graph(...)
n | 
 Number of vertices.  | 
directed | 
 Whether to create a directed graph.  | 
... | 
 Passed to   | 
An igraph graph.
Other deterministic constructors: 
graph_from_atlas(),
graph_from_edgelist(),
graph_from_literal(),
make_chordal_ring(),
make_full_citation_graph(),
make_full_graph(),
make_graph(),
make_lattice(),
make_ring(),
make_star(),
make_tree()
make_empty_graph(n = 10)
make_empty_graph(n = 5, directed = FALSE)