estrada_index(G)
The Estrada Index is a topological index of folding or 3D "compactness" ().
Let :None:None:`G=(V,E)` be a simple undirected graph with :None:None:`n` nodes and let :None:None:`\lambda_{1}\leq\lambda_{2}\leq\cdots\lambda_{n}` be a non-increasing ordering of the eigenvalues of its adjacency matrix :None:None:`A`. The Estrada index is (, )
If the graph is not undirected and simple.
Returns the Estrada index of a the graph G.
>>> G = nx.Graph([(0, 1), (1, 2), (1, 5), (5, 4), (2, 4), (2, 3), (4, 3), (3, 6)])See :
... ei = nx.estrada_index(G)
... print(f"{ei:0.5}") 20.55
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networkx.algorithms.centrality.subgraph_alg.estrada_index
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