/*
   igraph library.
   Copyright (C) 2010-2012  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>

int main(void) {
    igraph_matrix_t mat, mat2, mat3;
    igraph_sparsemat_t spmat, spmat2;

    /* Initialize the library. */
    igraph_setup();

    igraph_rng_seed(igraph_rng_default(), 42);

#define NROW 10
#define NCOL 7
#define NUM_NONZEROS 15

    igraph_matrix_init(&mat, NROW, NCOL);
    for (igraph_int_t i = 0; i < NUM_NONZEROS; i++) {
        igraph_int_t r = igraph_rng_get_integer(igraph_rng_default(), 0, NROW - 1);
        igraph_int_t c = igraph_rng_get_integer(igraph_rng_default(), 0, NCOL - 1);
        igraph_real_t val = igraph_rng_get_integer(igraph_rng_default(), 1, 10);
        MATRIX(mat, r, c) = val;
    }

    igraph_matrix_as_sparsemat(&spmat, &mat, /*tol=*/ 1e-14);
    igraph_matrix_init(&mat2, 0, 0);
    igraph_sparsemat_as_matrix(&mat2, &spmat);
    if (!igraph_matrix_all_e(&mat, &mat2)) {
        return 1;
    }

    igraph_sparsemat_compress(&spmat, &spmat2);
    igraph_matrix_init(&mat3, 0, 0);
    igraph_sparsemat_as_matrix(&mat3, &spmat2);
    if (!igraph_matrix_all_e(&mat, &mat3)) {
        return 2;
    }

    igraph_matrix_destroy(&mat);
    igraph_matrix_destroy(&mat2);
    igraph_matrix_destroy(&mat3);
    igraph_sparsemat_destroy(&spmat);
    igraph_sparsemat_destroy(&spmat2);

    return 0;
}
