/* -*- 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 g1, g2, res; igraph_vector_t v; /* composition with the empty graph */ igraph_empty(&g1, 5, IGRAPH_DIRECTED); igraph_full(&g2, 5, IGRAPH_DIRECTED, IGRAPH_NO_LOOPS); igraph_compose(&res, &g1, &g2); if (igraph_ecount(&res) != 0) { return 1; } igraph_destroy(&res); igraph_compose(&res, &g2, &g1); if (igraph_ecount(&res) != 0) { return 2; } igraph_destroy(&res); igraph_destroy(&g1); igraph_destroy(&g2); /* same but undirected */ igraph_empty(&g1, 5, IGRAPH_UNDIRECTED); igraph_full(&g2, 5, IGRAPH_UNDIRECTED, IGRAPH_NO_LOOPS); igraph_compose(&res, &g1, &g2); if (igraph_ecount(&res) != 0) { return 1; } igraph_destroy(&res); igraph_compose(&res, &g2, &g1); if (igraph_ecount(&res) != 0) { return 2; } igraph_destroy(&res); igraph_destroy(&g1); igraph_destroy(&g2); /* proper directed graph */ igraph_vector_init_int_end(&v, -1, 0,1, 1,2, 5,6, -1); igraph_create(&g1, &v, 0, IGRAPH_DIRECTED); igraph_vector_destroy(&v); igraph_vector_init_int_end(&v, -1, 0,1, 2,4, 5,6, -1); igraph_create(&g2, &v, 0, IGRAPH_DIRECTED); igraph_vector_destroy(&v); igraph_compose(&res, &g1, &g2); igraph_write_graph_edgelist(&res, stdout); igraph_destroy(&res); igraph_destroy(&g1); igraph_destroy(&g2); /* undirected graph */ igraph_vector_init_int_end(&v, -1, 0,1, 1,2, 5,6, -1); igraph_create(&g1, &v, 0, IGRAPH_UNDIRECTED); igraph_vector_destroy(&v); igraph_vector_init_int_end(&v, -1, 0,1, 0,4, 5,6, -1); igraph_create(&g2, &v, 0, IGRAPH_UNDIRECTED); igraph_vector_destroy(&v); igraph_compose(&res, &g1, &g2); igraph_write_graph_edgelist(&res, stdout); igraph_destroy(&res); igraph_destroy(&g1); igraph_destroy(&g2); return 0; }