networkx.algorithms.swap.double_edge_swap¶
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double_edge_swap
(G, nswap=1, max_tries=100)[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.
Parameters: - 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
Returns: G – The graph after double edge swaps.
Return type: graph
Notes
Does not enforce any connectivity constraints.
The graph G is modified in place.