[igraph] sort an edge sequence

[Ana Sofia Morais]

Hello,

 

I have an edge sequence taken from a directed graph, such as:

 

[55354] 1850 ->  618

[55355] 1850 ->  750

[55356] 1850 -> 1914

[55357] 1850 ->  649

[55358] 1850 -> 1160

[55359] 1850 ->  605

[55360] 1850 -> 2080

[55361] 1850 ->  563

[55362] 1850 ->   58

 

The first number in each line is the edge id. The second number and third numbers are the ids of the vertices that send and receive the edge, respectively.

 

The edge sequence is ordered by the edge ids. What I need to do is to sort the edge sequence by the id of the endpoint vertices, i.e., those that receive the edges. And I need to do so while preserving the edge ids.

 

I would be very  grateful if you could give me a suggestion to solve this problem.

 

Best,

 

Sofia