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/* -*- mode: C -*- */
/*
IGraph library.
Copyright (C) 2006 Gabor Csardi <csardi@rmki.kfki.hu>
MTA RMKI, Konkoly-Thege Miklos st. 29-33, Budapest 1121, Hungary
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 orig, sub, diff;
igraph_vector_t v;
/* Subtract from itself */
igraph_vector_init_int_end(&v, -1, 0,1,1,2,2,1,4,5, -1);
igraph_create(&orig, &v, 0, IGRAPH_DIRECTED);
igraph_vector_destroy(&v);
igraph_difference(&diff, &orig, &orig);
igraph_write_graph_edgelist(&diff, stdout);
if (igraph_ecount(&diff) != 0 ||
igraph_vcount(&diff) != igraph_vcount(&orig)) {
return 1;
}
igraph_destroy(&orig);
igraph_destroy(&diff);
/* Same for undirected graph */
igraph_vector_init_int_end(&v, -1, 0,1,1,2,2,1,4,5, -1);
igraph_create(&orig, &v, 0, IGRAPH_UNDIRECTED);
igraph_vector_destroy(&v);
igraph_vector_init_int_end(&v, -1, 1,0,1,2,2,1,4,5, -1);
igraph_create(&sub, &v, 0, IGRAPH_UNDIRECTED);
igraph_vector_destroy(&v);
igraph_difference(&diff, &orig, &sub);
igraph_write_graph_edgelist(&diff, stdout);
if (igraph_ecount(&diff) != 0 ||
igraph_vcount(&diff) != igraph_vcount(&orig)) {
return 2;
}
igraph_destroy(&orig);
igraph_destroy(&sub);
igraph_destroy(&diff);
/* Subtract the empty graph */
igraph_vector_init_int_end(&v, -1, 0,1,1,2,2,1,4,5, -1);
igraph_create(&orig, &v, 0, IGRAPH_DIRECTED);
igraph_vector_destroy(&v);
igraph_empty(&sub, 0, IGRAPH_DIRECTED);
igraph_difference(&diff, &orig, &sub);
igraph_write_graph_edgelist(&diff, stdout);
if (igraph_ecount(&diff) != igraph_ecount(&orig) ||
igraph_vcount(&diff) != igraph_vcount(&orig)) {
return 3;
}
igraph_destroy(&orig);
igraph_destroy(&sub);
igraph_destroy(&diff);
/* A `real' example */
igraph_vector_init_int_end(&v, -1, 0,1,1,2,2,1,4,5,8,9, -1);
igraph_create(&orig, &v, 0, IGRAPH_DIRECTED);
igraph_vector_destroy(&v);
igraph_vector_init_int_end(&v, -1, 0,1,5,4,2,1,6,7, -1);
igraph_create(&sub, &v, 0, IGRAPH_DIRECTED);
igraph_vector_destroy(&v);
igraph_difference(&diff, &orig, &sub);
igraph_write_graph_edgelist(&diff, stdout);
igraph_destroy(&diff);
igraph_destroy(&orig);
igraph_destroy(&sub);
/* undirected version */
igraph_vector_init_int_end(&v, -1, 0,1,1,2,2,1,4,5,8,9, -1);
igraph_create(&orig, &v, 0, IGRAPH_UNDIRECTED);
igraph_vector_destroy(&v);
igraph_vector_init_int_end(&v, -1, 0,1,5,4,2,1,6,7, -1);
igraph_create(&sub, &v, 0, IGRAPH_UNDIRECTED);
igraph_vector_destroy(&v);
igraph_difference(&diff, &orig, &sub);
igraph_write_graph_edgelist(&diff, stdout);
igraph_destroy(&diff);
igraph_destroy(&orig);
igraph_destroy(&sub);
return 0;
}
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