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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"
#include <math.h>
int main(void) {
igraph_t graph;
igraph_vector_t vector, weights;
igraph_real_t value;
/* Create a star graph, with vertex 0 at the center, and associated edge weights. */
igraph_star(&graph, 10, IGRAPH_STAR_UNDIRECTED, 0);
igraph_vector_init_range(&weights, 1, igraph_ecount(&graph)+1);
/* Initialize the vector where the result will be stored. */
igraph_vector_init(&vector, 0);
/* Compute eigenvector centrality. */
igraph_eigenvector_centrality(&graph, &vector, &value, IGRAPH_UNDIRECTED,
/*scale=*/ true, &weights, /*options=*/ NULL);
/* Print results. */
printf("eigenvalue: %g\n", value);
printf("eigenvector:\n");
igraph_vector_print(&vector);
/* Free allocated data structures. */
igraph_vector_destroy(&vector);
igraph_vector_destroy(&weights);
igraph_destroy(&graph);
return 0;
}
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