Use this if you are using igraph from R
Create a full graph
make_full_graph(n, directed = FALSE, loops = FALSE) full_graph(...)
n | 
 Number of vertices.  | 
directed | 
 Whether to create a directed graph.  | 
loops | 
 Whether to add self-loops to the graph.  | 
... | 
 Passed to   | 
An igraph graph
Other determimistic constructors: 
graph_from_atlas(),
graph_from_edgelist(),
graph_from_literal(),
make_chordal_ring(),
make_empty_graph(),
make_full_citation_graph(),
make_graph(),
make_lattice(),
make_ring(),
make_star(),
make_tree()
make_full_graph(5) print_all(make_full_graph(4, directed = TRUE))