# graph_from_graphnel

##### Convert graphNEL objects from the graph package to igraph

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.

##### Usage

`graph_from_graphnel(graphNEL, name = TRUE, weight = TRUE, unlist.attrs = TRUE)`

##### Arguments

- graphNEL
The graphNEL graph.

- name
Logical scalar, whether to add graphNEL vertex names as an igraph vertex attribute called ‘

`name`

’.- weight
Logical scalar, whether to add graphNEL edge weights as an igraph edge attribute called ‘

`weight`

’. (graphNEL graphs are always weighted.)- unlist.attrs
Logical scalar. graphNEL attribute query functions return the values of the attributes in R lists, if this argument is

`TRUE`

(the default) these will be converted to atomic vectors, whenever possible, before adding them to the igraph graph.

##### Details

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.

##### Value

`graph_from_graphnel`

returns an igraph graph object.

##### See Also

`as_graphnel`

for the other direction,
`as_adj`

, `graph_from_adjacency_matrix`

,
`as_adj_list`

and `graph.adjlist`

for other
graph representations.

##### Examples

```
# 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
# }
```

*Documentation reproduced from package igraph, version 1.2.6, License: GPL (>= 2)*