CODEWITHSUNDEEP
pythonnetworkx
ilovecp3
ilovecp3

Reputation: 2915

How to add edge to the end of the list by using networkx

I encounter some problems when using networkx in python, hope someone could help me. The code is as follows:

G = nx.Graph()
G.add_edge(1,4)
G.add_edge(1,2)
print G.edges()

G.add_node(3)
G.remove_edge(1,2)
G.add_edge(1,3)
G.add_edge(4,3)
print G.nodes()
print G.edges()

the output in python is:

[(1, 2), (1, 4)]
[1, 2, 3, 4]
[(1, 3), (1, 4), (3, 4)]

however, my desired output is:

[(1, 4),(1, 2)]
[1, 2, 3, 4]
[(1, 4), (1, 3), (3, 4)]

the order in the list of edges is extremely important in my implementation, I checked my code for an hour and finally find this bug here, it seems that networkx order the edges automatically with the smallest number goes to first, is there any method to let the order of edges be the order as I add them? Hope someone can help me, I will wait on line, thanks

Upvotes: 1

Views: 317

Answers (1)

Aric
Aric

Reputation: 25319

The order of the nodes and edges produced by G.nodes() and G.edges() is arbitrary and you cannot control it using NetworkX. You can certainly keep track of any ordering yourself with a separate data structure (such as a list).

Upvotes: 1

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