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/* -*- mode: C -*- */
/* vim:set ts=2 sw=2 sts=2 et: */
/*
IGraph library.
Copyright (C) 2011-2012 Gabor Csardi <csardi.gabor@gmail.com>
334 Harvard st, 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 <string.h>
int main() {
igraph_t g;
igraph_vector_t weights, result;
igraph_bool_t dag;
igraph_vector_init(&result, 0);
/***********************************************************************/
/* Approximation with Eades' method */
/***********************************************************************/
/* Simple unweighted graph */
igraph_small(&g, 0, IGRAPH_DIRECTED, 0,1, 1,2, 2,0, 2,3, 2,4, 0,4, 4,3, 5,0, 6,5, -1);
igraph_feedback_arc_set(&g, &result, 0, IGRAPH_FAS_APPROX_EADES);
igraph_vector_print(&result);
igraph_delete_edges(&g, igraph_ess_vector(&result));
igraph_is_dag(&g, &dag);
if (!dag)
return 1;
igraph_destroy(&g);
/* Simple weighted graph */
igraph_small(&g, 0, IGRAPH_DIRECTED, 0,1, 1,2, 2,0, 2,3, 2,4, 0,4, 4,3, 5,0, 6,5, -1);
igraph_vector_init_int_end(&weights, -1, 1, 1, 3, 1, 1, 1, 1, 1, 1, -1);
igraph_feedback_arc_set(&g, &result, &weights, IGRAPH_FAS_APPROX_EADES);
igraph_vector_print(&result);
igraph_delete_edges(&g, igraph_ess_vector(&result));
igraph_is_dag(&g, &dag);
if (!dag)
return 2;
igraph_vector_destroy(&weights);
igraph_destroy(&g);
/* Simple unweighted graph with loops */
igraph_small(&g, 0, IGRAPH_DIRECTED, 0,1, 1,2, 2,0, 2,3, 2,4, 0,4, 4,3, 5,0, 6,5, 1,1, 4,4, -1);
igraph_feedback_arc_set(&g, &result, 0, IGRAPH_FAS_APPROX_EADES);
igraph_vector_print(&result);
igraph_delete_edges(&g, igraph_ess_vector(&result));
igraph_is_dag(&g, &dag);
if (!dag)
return 3;
igraph_destroy(&g);
igraph_vector_destroy(&result);
return 0;
}
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