example_edge_betweenness.c

//Calculate merge matrix
igraph_community_edge_betweenness(&graph, &result, NULL, &M, NULL, IGRAPH_DIRECTED);

// Initialize max modularity
maxmod = 0.0;

// Determine max number of steps to merge
maxsteps = igraph_matrix_nrow(&M) < igraph_vcount(&graph) - 1) ? igraph_matrix_nrow(&M) : igraph_vcount(&graph) - 1;
    
// Compare merge modularities and keep only the best
for (steps=1; steps < maxsteps; steps++) {
    igraph_community_to_membership(&M, igraph_vcount(&graph), steps, &membership, 0);
    igraph_modularity(&graph, &membership, &modularity, 0);

    if (modularity > maxmod) {
        igraph_vector_update(&maxmembership, &membership);
        maxmod = modularity;
    }
}