pub fn core_persistence(graph: &Graph) -> IgraphResult<f64>Expand description
Average coreness divided by the degeneracy (maximum coreness).
Returns a value in [0, 1]. A value of 1 means every vertex has the same coreness (e.g. a complete graph). A value near 0 means most vertices are in low-order cores while the degeneracy is high.
Returns 0.0 for graphs where the degeneracy is 0 (edgeless graphs).
§Examples
use rust_igraph::{Graph, core_persistence};
// K3: all coreness = 2, degeneracy = 2 → persistence = 1.0
let g = Graph::from_edges(&[(0, 1), (1, 2), (0, 2)], false, Some(3)).unwrap();
assert!((core_persistence(&g).unwrap() - 1.0).abs() < 1e-10);