double_edge_swap(G, nswap=1, max_tries=100, seed=None)[source]¶
Swap two edges in the graph while keeping the node degrees fixed.
A double-edge swap removes two randomly chosen edges u-v and x-y and creates the new edges u-x and v-y:
u--v u v becomes | | x--y x y
If either the edge u-x or v-y already exist no swap is performed and another attempt is made to find a suitable edge pair.
- G (graph) – An undirected graph
- nswap (integer (optional, default=1)) – Number of double-edge swaps to perform
- max_tries (integer (optional)) – Maximum number of attempts to swap edges
- seed (integer, random_state, or None (default)) – Indicator of random number generation state. See Randomness.
G – The graph after double edge swaps.
Does not enforce any connectivity constraints.
The graph G is modified in place.