Use this if you are using igraph from R
Reverse the order in an edge sequence
## S3 method for class 'igraph.es' rev(x)
| x | The edge sequence to reverse. | 
The reversed edge sequence.
Other vertex and edge sequence operations: c.igraph.es,
c.igraph.vs,
difference.igraph.es,
difference.igraph.vs,
igraph-es-indexing2,
igraph-es-indexing,
igraph-vs-indexing2,
igraph-vs-indexing,
intersection.igraph.es,
intersection.igraph.vs,
rev.igraph.vs,
union.igraph.es,
union.igraph.vs,
unique.igraph.es,
unique.igraph.vs
g <- make_(ring(10), with_vertex_(name = LETTERS[1:10])) E(g) E(g) %>% rev()