Function degree_mad 

pub fn degree_mad(graph: &Graph) -> IgraphResult<f64>

Compute the mean absolute deviation of the degree sequence.

MAD(G) = (1/n) Σ_v |d(v) - d̄|

A robust dispersion measure less sensitive to outliers than variance. Returns 0.0 for empty or edgeless graphs.

Examples

use rust_igraph::{Graph, degree_mad};

// K_3: all degrees equal → MAD = 0
let g = Graph::from_edges(&[(0,1),(1,2),(0,2)], false, Some(3)).unwrap();
assert!(degree_mad(&g).unwrap().abs() < 1e-10);