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biguint_betweenness.c
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biguint_betweenness.c
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/* -*- mode: C -*- */
/*
IGraph library.
Copyright (C) 2009-2012 Gabor Csardi <csardi.gabor@gmail.com>
334 Harvard street, Cambridge, MA 02139 USA
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include <igraph.h>
#include <stdlib.h>
int check(const igraph_vector_t *v1, const igraph_vector_t *v2, int code) {
igraph_vector_t v;
long int i, n=igraph_vector_size(v1);
igraph_real_t m;
igraph_vector_copy(&v, v1);
igraph_vector_sub(&v, v2);
for (i=0; i<n; i++) {
VECTOR(v)[i] = fabs(VECTOR(v)[i]);
}
if ( (m=igraph_vector_max(&v)) > 0.01) {
printf("Difference: %g\n", m);
exit(code);
}
igraph_vector_destroy(&v);
return 0;
}
int main() {
igraph_t g;
igraph_vector_t bet, bet2, weights, edges;
igraph_vector_t bbet, bbet2;
igraph_real_t nontriv[] = { 0, 19, 0, 16, 0, 20, 1, 19, 2, 5, 3, 7, 3, 8,
4, 15, 4, 11, 5, 8, 5, 19, 6, 7, 6, 10, 6, 8,
6, 9, 7, 20, 9, 10, 9, 20, 10, 19,
11, 12, 11, 20, 12, 15, 13, 15,
14, 18, 14, 16, 14, 17, 15, 16, 17, 18 };
igraph_real_t nontriv_weights[] = { 0.5249, 1, 0.1934, 0.6274, 0.5249,
0.0029, 0.3831, 0.05, 0.6274, 0.3831,
0.5249, 0.0587, 0.0579, 0.0562, 0.0562,
0.1934, 0.6274, 0.6274, 0.6274, 0.0418,
0.6274, 0.3511, 0.3511, 0.1486, 1, 1,
0.0711, 0.2409 };
igraph_real_t nontriv_res[] = { 20, 0, 0, 0, 0, 19, 80, 85, 32, 0, 10,
75, 70, 0, 36, 81, 60, 0, 19, 19, 86 };
/*******************************************************/
igraph_barabasi_game(/* graph= */ &g,
/* n= */ 1000,
/* power= */ 1,
/* m= */ 3,
/* outseq= */ 0,
/* outpref= */ 0,
/* A= */ 1,
/* directed= */ 0,
/* algo= */ IGRAPH_BARABASI_BAG,
/* start_from= */ 0);
igraph_simplify(&g, /* multiple= */ 1, /* loops= */ 1, /*edge_comb=*/ 0);
igraph_vector_init(&bet, 0);
igraph_vector_init(&bbet, 0);
igraph_betweenness_estimate(/* graph= */ &g,
/* res= */ &bet,
/* vids= */ igraph_vss_all(),
/* directed = */ 0,
/* cutoff= */ 2,
/* weights= */ 0,
/* nobigint= */ 1);
igraph_betweenness_estimate(/* graph= */ &g,
/* res= */ &bbet,
/* vids= */ igraph_vss_all(),
/* directed = */ 0,
/* cutoff= */ 2,
/* weights= */ 0,
/* nobigint= */ 0);
check(&bet, &bbet, 10);
igraph_vector_destroy(&bet);
igraph_vector_destroy(&bbet);
igraph_destroy(&g);
/*******************************************************/
igraph_tree(&g, 20000, 10, IGRAPH_TREE_UNDIRECTED);
igraph_vector_init(&bet, 0);
igraph_vector_init(&bbet, 0);
igraph_betweenness_estimate(/* graph= */ &g,
/* res= */ &bet,
/* vids= */ igraph_vss_all(),
/* directed = */ 0,
/* cutoff= */ 3,
/* weights= */ 0,
/* nobigint= */ 1);
igraph_betweenness_estimate(/* graph= */ &g,
/* res= */ &bbet,
/* vids= */ igraph_vss_all(),
/* directed = */ 0,
/* cutoff= */ 3,
/* weights= */ 0,
/* nobigint= */ 0);
check(&bet, &bbet, 20);
igraph_vector_init(&bet2, 0);
igraph_vector_init(&bbet2, 0);
igraph_vector_init(&weights, igraph_ecount(&g));
igraph_vector_fill(&weights, 1.0);
igraph_betweenness_estimate(/* graph= */ &g,
/* res= */ &bet2,
/* vids= */ igraph_vss_all(),
/* directed = */ 0,
/* cutoff= */ 3,
/* weights= */ &weights,
/* nobigint= */ 1);
igraph_betweenness_estimate(/* graph= */ &g,
/* res= */ &bbet2,
/* vids= */ igraph_vss_all(),
/* directed = */ 0,
/* cutoff= */ 3,
/* weights= */ &weights,
/* nobigint= */ 0);
if (!igraph_vector_all_e(&bet, &bet2)) {
return 1;
}
/* if (!igraph_vector_all_e(&bbet, &bbet2)) { */
/* return 2; */
/* } */
check(&bet, &bbet, 30);
check(&bet2, &bbet2, 40);
igraph_vector_destroy(&bet);
igraph_vector_destroy(&bet2);
igraph_vector_destroy(&bbet);
igraph_vector_destroy(&bbet2);
igraph_vector_destroy(&weights);
igraph_destroy(&g);
/* Non-trivial weighted graph */
igraph_vector_view(&edges, nontriv, sizeof(nontriv)/sizeof(igraph_real_t));
igraph_create(&g, &edges, 0, /* directed= */ 0);
igraph_vector_view(&weights, nontriv_weights,
sizeof(nontriv_weights)/sizeof(igraph_real_t));
igraph_vector_init(&bet, 0);
igraph_vector_init(&bbet, 0);
igraph_betweenness(/*graph=*/ &g, /*res=*/ &bet, /*vids=*/ igraph_vss_all(),
/*directed=*/0, /*weights=*/ &weights, /*nobigint=*/ 1);
igraph_betweenness(/*graph=*/ &g, /*res=*/ &bbet, /*vids=*/ igraph_vss_all(),
/*directed=*/0, /*weights=*/ &weights, /*nobigint=*/ 0);
igraph_vector_view(&bet2, nontriv_res,
sizeof(nontriv_res)/sizeof(igraph_real_t));
if (!igraph_vector_all_e(&bet, &bet2)) {
return 2;
}
check(&bet, &bbet, 50);
igraph_vector_destroy(&bet);
igraph_vector_destroy(&bbet);
igraph_destroy(&g);
if (IGRAPH_FINALLY_STACK_SIZE() != 0) return 3;
return 0;
}