G.copy() takes a long time..

[Sudarshan Iyengar]

>>>import networkx as nx

>>>G=nx.erdos_renyi_graph(2000,0.5)

>>>H=nx.copy()

The second line takes very less time while the third line takes a lot
of time. Why is replicating a graph taking so much time?

[Dan Schult]

Your example has some typos in it... but it is not surprising
to me that the .copy() method is slower than creation. It is
doing a "deepcopy" of the graph data structure. You might try

>>> H=nx.Graph(G)

which copies the edges with only a shallow copy of edge data.
Perhaps we should add this to the .copy() documentation.

Dan

[Sudarshan Iyengar]

Hi Dan,

I am sorry for the mistake in my previous email.

It wasn't H=nx.copy() it was H=G.copy()

Thank you for your input, I am still surprised why a copying action
takes so much time.

Sudarshan

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