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/* -*- mode: C -*- */
/*
IGraph library.
Copyright (C) 2007-2012 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>
int main() {
igraph_t g;
igraph_matrix_t merges;
igraph_vector_t modularity;
long int no_of_nodes;
long int i;
igraph_small(&g, 5, IGRAPH_UNDIRECTED,
0,1,0,2,0,3,0,4, 1,2,1,3,1,4, 2,3,2,4, 3,4,
5,6,5,7,5,8,5,9, 6,7,6,8,6,9, 7,8,7,9, 8,9, 0,5, -1);
igraph_vector_init(&modularity, 0);
igraph_matrix_init(&merges, 0, 0);
igraph_community_walktrap(&g, 0 /* no weights */,
4 /* steps */,
&merges, &modularity,
/* membership=*/ 0);
no_of_nodes=igraph_vcount(&g);
printf("Merges:\n");
for (i=0; i<igraph_matrix_nrow(&merges); i++) {
printf("%2.1li + %2.li -> %2.li (modularity %4.2f)\n",
(long int)MATRIX(merges, i, 0),
(long int)MATRIX(merges, i, 1),
no_of_nodes+i,
VECTOR(modularity)[i]);
}
igraph_destroy(&g);
/* isolated vertices */
igraph_small(&g, 5, IGRAPH_UNDIRECTED, -1);
if (igraph_community_walktrap(&g, 0 /* no weights */, 4 /* steps */, &merges,
&modularity, /* membership = */ 0)) {
return 1;
}
if (igraph_vector_min(&modularity) != 0 || igraph_vector_max(&modularity) != 0) {
return 2;
}
igraph_destroy(&g);
igraph_matrix_destroy(&merges);
igraph_vector_destroy(&modularity);
return 0;
}
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