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/* -*- mode: C -*- */
/*
IGraph library.
Copyright (C) 2011-2012 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>
#define DIM1 10
#define DIM2 5
#define DIM3 6
#define INT(a) (igraph_rng_get_integer(igraph_rng_default(), 0, (a)))
#define REAL() (igraph_rng_get_normal(igraph_rng_default(), 0, 1))
int main() {
igraph_sparsemat_t sA, sB, sC;
igraph_matrix_t A1, A2, A3, B, C;
int i;
igraph_rng_seed(igraph_rng_default(), 42);
igraph_sparsemat_init(&sA, DIM1, DIM2, 20);
for (i=0; i<10; i++) {
igraph_sparsemat_entry(&sA, INT(DIM1-1), INT(DIM2-1), REAL());
}
igraph_sparsemat_compress(&sA, &sB);
igraph_sparsemat_destroy(&sA);
igraph_sparsemat_init(&sA, DIM2, DIM3, 20);
for (i=0; i<10; i++) {
igraph_sparsemat_entry(&sA, INT(DIM2-1), INT(DIM3-1), REAL());
}
igraph_sparsemat_compress(&sA, &sC);
igraph_sparsemat_destroy(&sA);
igraph_matrix_init(&B, 0, 0);
igraph_sparsemat_as_matrix(&B, &sB);
igraph_matrix_init(&C, 0, 0);
igraph_sparsemat_as_matrix(&C, &sC);
/* All possible products */
igraph_sparsemat_multiply(&sB, &sC, &sA);
igraph_matrix_init(&A1, 0, 0);
igraph_sparsemat_as_matrix(&A1, &sA);
igraph_matrix_init(&A2, 0, 0);
igraph_sparsemat_dense_multiply(&B, &sC, &A2);
igraph_matrix_init(&A3, 0, 0);
igraph_sparsemat_multiply_by_dense(&sB, &C, &A3);
if (igraph_matrix_maxdifference(&A1, &A2) > 1e-10 ||
igraph_matrix_maxdifference(&A2, &A3) > 1e-10) {
return 1;
}
igraph_sparsemat_destroy(&sA);
igraph_sparsemat_destroy(&sB);
igraph_sparsemat_destroy(&sC);
igraph_matrix_destroy(&A1);
igraph_matrix_destroy(&A2);
igraph_matrix_destroy(&A3);
igraph_matrix_destroy(&B);
igraph_matrix_destroy(&C);
return 0;
}
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