Use this if you are using igraph from R
The graphNEL class is defined in the graph
package, it is another
way to represent graphs. graph_from_graphnel
takes a graphNEL
graph and converts it to an igraph graph. It handles all
graph/vertex/edge attributes. If the graphNEL graph has a vertex
attribute called ‘name
’ it will be used as igraph vertex
attribute ‘name
’ and the graphNEL vertex names will be
ignored.
graph_from_graphnel(graphNEL, name = TRUE, weight = TRUE, unlist.attrs = TRUE)
graphNEL 
The graphNEL graph. 
name 
Logical scalar, whether to add graphNEL vertex names as an
igraph vertex attribute called ‘ 
weight 
Logical scalar, whether to add graphNEL edge weights as an
igraph edge attribute called ‘ 
unlist.attrs 
Logical scalar. graphNEL attribute query functions
return the values of the attributes in R lists, if this argument is

Because graphNEL graphs poorly support multiple edges, the edge attributes of the multiple edges are lost: they are all replaced by the attributes of the first of the multiple edges.
graph_from_graphnel
returns an igraph graph object.
as_graphnel
for the other direction,
as_adj
, graph_from_adjacency_matrix
,
as_adj_list
and graph.adjlist
for other
graph representations.
## Not run: ## Undirected g < make_ring(10) V(g)$name < letters[1:10] GNEL < as_graphnel(g) g2 < graph_from_graphnel(GNEL) g2 ## Directed g3 < make_star(10, mode="in") V(g3)$name < letters[1:10] GNEL2 < as_graphnel(g3) g4 < graph_from_graphnel(GNEL2) g4 ## End(Not run)