Restore 0.1.5 version from stash

2025-12-08 19:56:24 +08:00
parent de189e938d
commit 8db3f4e32d
8578 changed files with 2703426 additions and 217 deletions
@@ -0,0 +1,30 @@
+import networkx as nx
+
+__all__ = ["s_metric"]
+
+
+@nx._dispatchable
+def s_metric(G):
+    """Returns the s-metric [1]_ of graph.
+
+    The s-metric is defined as the sum of the products ``deg(u) * deg(v)``
+    for every edge ``(u, v)`` in `G`.
+
+    Parameters
+    ----------
+    G : graph
+        The graph used to compute the s-metric.
+
+    Returns
+    -------
+    s : float
+        The s-metric of the graph.
+
+    References
+    ----------
+    .. [1] Lun Li, David Alderson, John C. Doyle, and Walter Willinger,
+           Towards a Theory of Scale-Free Graphs:
+           Definition, Properties, and  Implications (Extended Version), 2005.
+           https://arxiv.org/abs/cond-mat/0501169
+    """
+    return float(sum(G.degree(u) * G.degree(v) for (u, v) in G.edges()))