Use this if you are using igraph from R

Check whether a graph is directed

is_directed(graph)

`graph` |
The input graph |

Logical scalar, whether the graph is directed.

Other structural queries: `[.igraph`

,
`[[.igraph`

, `adjacent_vertices`

,
`are_adjacent`

, `ends`

,
`get.edge.ids`

, `gorder`

,
`gsize`

, `head_of`

,
`incident_edges`

, `incident`

,
`neighbors`

, `tail_of`

g <- make_ring(10) is_directed(g) g2 <- make_ring(10, directed = TRUE) is_directed(g2)

[Package *igraph* version 1.2.4.1 Index]