Function compare_communities 

pub fn compare_communities(
    comm1: &[u32],
    comm2: &[u32],
    method: CommunityComparison,
) -> IgraphResult<f64>

Compare two community membership vectors over the same vertex set.

Both vectors must have the same length. Cluster ids do not have to be densified — they are reindexed internally via crate::reindex_membership.

The returned f64 carries either a distance (VI, SplitJoin) or a similarity (NMI, Rand, AdjustedRand) depending on CommunityComparison.

Examples

use rust_igraph::{compare_communities, CommunityComparison};

// Identical partitions.
let q = compare_communities(
    &[0, 0, 1, 1],
    &[5, 5, 7, 7],
    CommunityComparison::NormalizedMutualInformation,
).unwrap();
assert!((q - 1.0).abs() < 1e-12);

let q = compare_communities(
    &[0, 0, 1, 1],
    &[5, 5, 7, 7],
    CommunityComparison::VariationOfInformation,
).unwrap();
assert!(q.abs() < 1e-12);

Errors

• IgraphError::InvalidArgument if comm1.len() != comm2.len().
• IgraphError::InvalidArgument if n < 2 and method is Rand or AdjustedRand (mirrors the C reference).