This documents the development version of NetworkX. Documentation for the current release can be found here.
scale_free_graph(n, alpha=0.41, beta=0.54, gamma=0.05, delta_in=0.2, delta_out=0, create_using=None, seed=None)¶
Returns a scale-free directed graph.
Number of nodes in graph
Probability for adding a new node connected to an existing node chosen randomly according to the in-degree distribution.
Probability for adding an edge between two existing nodes. One existing node is chosen randomly according the in-degree distribution and the other chosen randomly according to the out-degree distribution.
Probability for adding a new node connected to an existing node chosen randomly according to the out-degree distribution.
Bias for choosing nodes from in-degree distribution.
Bias for choosing nodes from out-degree distribution.
- create_usingNetworkX graph constructor, optional
The default is a MultiDiGraph 3-cycle. If a graph instance, use it without clearing first. If a graph constructor, call it to construct an empty graph.
- seedinteger, random_state, or None (default)
Indicator of random number generation state. See Randomness.
The sum of
gammamust be 1.
B. Bollobás, C. Borgs, J. Chayes, and O. Riordan, Directed scale-free graphs, Proceedings of the fourteenth annual ACM-SIAM Symposium on Discrete Algorithms, 132–139, 2003.
Create a scale-free graph on one hundred nodes:
>>> G = nx.scale_free_graph(100)