Abdelrahman Said
140 lines
4.5 KiB
C
140 lines
4.5 KiB
C
/*
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igraph library.
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Copyright (C) 2006-2012 Gabor Csardi <csardi.gabor@gmail.com>
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334 Harvard street, Cambridge, MA 02139 USA
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA
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*/
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#include <igraph.h>
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int main(void) {
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igraph_t orig, sub, diff;
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igraph_vector_int_t v;
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/* Initialize the library. */
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igraph_setup();
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/* Subtract from itself */
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printf("subtract itself\n");
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igraph_vector_int_init_int_end(&v, -1, 0, 1, 1, 2, 2, 1, 4, 5, -1);
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igraph_create(&orig, &v, 0, IGRAPH_DIRECTED);
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igraph_vector_int_destroy(&v);
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igraph_difference(&diff, &orig, &orig);
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igraph_write_graph_edgelist(&diff, stdout);
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if (igraph_ecount(&diff) != 0 ||
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igraph_vcount(&diff) != igraph_vcount(&orig)) {
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return 1;
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}
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igraph_destroy(&orig);
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igraph_destroy(&diff);
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/* Same for undirected graph */
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printf("subtract itself, undirected\n");
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igraph_vector_int_init_int_end(&v, -1, 0, 1, 1, 2, 2, 1, 4, 5, -1);
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igraph_create(&orig, &v, 0, IGRAPH_UNDIRECTED);
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igraph_vector_int_destroy(&v);
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igraph_vector_int_init_int_end(&v, -1, 1, 0, 1, 2, 2, 1, 4, 5, -1);
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igraph_create(&sub, &v, 0, IGRAPH_UNDIRECTED);
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igraph_vector_int_destroy(&v);
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igraph_difference(&diff, &orig, &sub);
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igraph_write_graph_edgelist(&diff, stdout);
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if (igraph_ecount(&diff) != 0 ||
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igraph_vcount(&diff) != igraph_vcount(&orig)) {
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return 2;
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}
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igraph_destroy(&orig);
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igraph_destroy(&sub);
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igraph_destroy(&diff);
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/* Subtract the empty graph */
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printf("subtract empty\n");
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igraph_vector_int_init_int_end(&v, -1, 0, 1, 1, 2, 2, 1, 4, 5, -1);
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igraph_create(&orig, &v, 0, IGRAPH_DIRECTED);
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igraph_vector_int_destroy(&v);
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igraph_empty(&sub, 3, IGRAPH_DIRECTED);
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igraph_difference(&diff, &orig, &sub);
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igraph_write_graph_edgelist(&diff, stdout);
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if (igraph_ecount(&diff) != igraph_ecount(&orig) ||
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igraph_vcount(&diff) != igraph_vcount(&orig)) {
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return 3;
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}
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igraph_destroy(&orig);
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igraph_destroy(&sub);
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igraph_destroy(&diff);
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/* A `real' example */
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printf("real example\n");
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igraph_vector_int_init_int_end(&v, -1, 0, 1, 1, 2, 2, 1, 4, 5, 8, 9, -1);
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igraph_create(&orig, &v, 0, IGRAPH_DIRECTED);
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igraph_vector_int_destroy(&v);
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igraph_vector_int_init_int_end(&v, -1, 0, 1, 5, 4, 2, 1, 6, 7, -1);
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igraph_create(&sub, &v, 0, IGRAPH_DIRECTED);
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igraph_vector_int_destroy(&v);
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igraph_difference(&diff, &orig, &sub);
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igraph_write_graph_edgelist(&diff, stdout);
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igraph_destroy(&diff);
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igraph_destroy(&orig);
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igraph_destroy(&sub);
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/* undirected version */
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printf("real example, undirected\n");
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igraph_vector_int_init_int_end(&v, -1, 0, 1, 1, 2, 2, 1, 4, 5, 8, 9, 8, 10, 8, 13, 8, 11, 8, 12, -1);
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igraph_create(&orig, &v, 0, IGRAPH_UNDIRECTED);
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igraph_vector_int_destroy(&v);
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igraph_vector_int_init_int_end(&v, -1, 0, 1, 5, 4, 2, 1, 6, 7, 8, 10, 8, 13, -1);
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igraph_create(&sub, &v, 0, IGRAPH_UNDIRECTED);
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igraph_vector_int_destroy(&v);
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igraph_difference(&diff, &orig, &sub);
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igraph_write_graph_edgelist(&diff, stdout);
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igraph_destroy(&diff);
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igraph_destroy(&orig);
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igraph_destroy(&sub);
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/* undirected version with loop edge, tests Github issue #597 */
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printf("Github issue #597, undirected\n");
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igraph_vector_int_init_int_end(&v, -1, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 0, -1);
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igraph_create(&orig, &v, 0, IGRAPH_UNDIRECTED);
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igraph_vector_int_destroy(&v);
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igraph_vector_int_init_int_end(&v, -1, 0, 1, 1, 2, 2, 3, 3, 4, 4, 0, -1);
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igraph_create(&sub, &v, 0, IGRAPH_UNDIRECTED);
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igraph_vector_int_destroy(&v);
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igraph_difference(&diff, &orig, &sub);
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igraph_write_graph_edgelist(&diff, stdout);
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igraph_destroy(&diff);
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igraph_destroy(&orig);
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igraph_destroy(&sub);
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return 0;
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}
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