This set of functions tries to calculate a ranking of the edges in a graph so that edges sharing certain topological traits are in proximity in the resulting order.
edge_rank_eulerian(cyclic = FALSE)
should the eulerian path start and end at the same node
An integer vector giving the position of each edge in the ranking
edge_rank_eulerian(): Calculcate ranking as the visit order of a eulerian
path or cycle. If no such path or cycle exist it will return a vector of