/* call-seq: * graph.edge_betweenness(mode) -> Array * * Returns an Array of betweenness centrality measures for the edges * in the graph. mode defines whether directed paths or considered for * directed graphs. */ VALUE cIGraph_edge_betweenness(VALUE self, VALUE directed){ igraph_t *graph; igraph_bool_t dir = 0; igraph_vector_t res; int i; VALUE betweenness = rb_ary_new(); if(directed == Qtrue) dir = 1; //vector to hold the results of the degree calculations igraph_vector_init_int(&res,0); Data_Get_Struct(self, igraph_t, graph); igraph_edge_betweenness(graph,&res,dir); for(i=0;i<igraph_vector_size(&res);i++){ rb_ary_push(betweenness,INT2NUM((int)VECTOR(res)[i])); } igraph_vector_destroy(&res); return betweenness; }
int main() { igraph_t g; igraph_vector_t eb; igraph_small(&g, 0, IGRAPH_UNDIRECTED, 0, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 8, 0, 10, 0, 11, 0, 12, 0, 13, 0, 17, 0, 19, 0, 21, 0, 31, 1, 2, 1, 3, 1, 7, 1, 13, 1, 17, 1, 19, 1, 21, 1, 30, 2, 3, 2, 7, 2, 8, 2, 9, 2, 13, 2, 27, 2, 28, 2, 32, 3, 7, 3, 12, 3, 13, 4, 6, 4, 10, 5, 6, 5, 10, 5, 16, 6, 16, 8, 30, 8, 32, 8, 33, 9, 33, 13, 33, 14, 32, 14, 33, 15, 32, 15, 33, 18, 32, 18, 33, 19, 33, 20, 32, 20, 33, 22, 32, 22, 33, 23, 25, 23, 27, 23, 29, 23, 32, 23, 33, 24, 25, 24, 27, 24, 31, 25, 31, 26, 29, 26, 33, 27, 33, 28, 31, 28, 33, 29, 32, 29, 33, 30, 32, 30, 33, 31, 32, 31, 33, 32, 33, -1); igraph_vector_init(&eb, igraph_ecount(&g)); igraph_edge_betweenness(&g, &eb, IGRAPH_UNDIRECTED); print_vector(&eb, stdout); igraph_vector_destroy(&eb); igraph_destroy(&g); igraph_small(&g, 0, IGRAPH_UNDIRECTED, 0, 1, 0, 2, 0, 3, 1, 4, -1); igraph_vector_init(&eb, igraph_ecount(&g)); igraph_edge_betweenness_estimate(&g, &eb, IGRAPH_UNDIRECTED, 2); print_vector(&eb, stdout); igraph_vector_destroy(&eb); igraph_destroy(&g); igraph_small(&g, 0, IGRAPH_UNDIRECTED, 0, 1, 0, 3, 1, 2, 1, 4, 2, 5, 3, 4, 3, 6, 4, 5, 4, 7, 5, 8, 6, 7, 7, 8, -1); igraph_vector_init(&eb, igraph_ecount(&g)); igraph_edge_betweenness_estimate(&g, &eb, IGRAPH_UNDIRECTED, 2); print_vector(&eb, stdout); igraph_vector_destroy(&eb); igraph_destroy(&g); return 0; }
int main() { igraph_t g, tree; igraph_vector_t eb, edges; long int i; igraph_small(&g, 0, IGRAPH_UNDIRECTED, 0, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 8, 0, 10, 0, 11, 0, 12, 0, 13, 0, 17, 0, 19, 0, 21, 0, 31, 1, 2, 1, 3, 1, 7, 1, 13, 1, 17, 1, 19, 1, 21, 1, 30, 2, 3, 2, 7, 2, 8, 2, 9, 2, 13, 2, 27, 2, 28, 2, 32, 3, 7, 3, 12, 3, 13, 4, 6, 4, 10, 5, 6, 5, 10, 5, 16, 6, 16, 8, 30, 8, 32, 8, 33, 9, 33, 13, 33, 14, 32, 14, 33, 15, 32, 15, 33, 18, 32, 18, 33, 19, 33, 20, 32, 20, 33, 22, 32, 22, 33, 23, 25, 23, 27, 23, 29, 23, 32, 23, 33, 24, 25, 24, 27, 24, 31, 25, 31, 26, 29, 26, 33, 27, 33, 28, 31, 28, 33, 29, 32, 29, 33, 30, 32, 30, 33, 31, 32, 31, 33, 32, 33, -1); igraph_vector_init(&eb, igraph_ecount(&g)); igraph_edge_betweenness(&g, &eb, IGRAPH_UNDIRECTED, /*weights=*/ 0); for (i=0; i<igraph_vector_size(&eb); i++) { VECTOR(eb)[i] = -VECTOR(eb)[i]; } igraph_minimum_spanning_tree_prim(&g, &tree, &eb); igraph_write_graph_edgelist(&tree, stdout); igraph_vector_init(&edges, 0); igraph_minimum_spanning_tree(&g, &edges, &eb); igraph_vector_print(&edges); igraph_vector_destroy(&edges); igraph_destroy(&tree); igraph_destroy(&g); igraph_vector_destroy(&eb); return 0; }