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/*=============================================================================
This file is part of FLINT.
FLINT 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.
FLINT 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 FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
=============================================================================*/
/******************************************************************************
Copyright (C) 2014 Abhinav Baid
******************************************************************************/
#include "fmpz_mat.h"
#include "ulong_extras.h"
#define FMPZ_MAT_CHOL_EPS (1.0E-9)
int
main(void)
{
int i;
FLINT_TEST_INIT(state);
flint_printf("chol_d....");
fflush(stdout);
/* check RR^T = A */
for (i = 0; i < 1000 * flint_test_multiplier(); i++)
{
fmpz_mat_t A;
d_mat_t R, Rt, Atmp, Btmp;
slong m;
m = n_randint(state, 10);
fmpz_mat_init(A, m, m);
d_mat_init(R, m, m);
d_mat_init(Rt, m, m);
d_mat_init(Atmp, m, m);
d_mat_init(Btmp, m, m);
fmpz_mat_randtest(A, state, 10);
fmpz_mat_gram(A, A);
fmpz_mat_get_d_mat(Atmp, A);
d_mat_zero(R);
fmpz_mat_chol_d(R, A);
d_mat_transpose(Rt, R);
d_mat_mul_classical(Btmp, R, Rt);
if (!d_mat_approx_equal(Atmp, Btmp, FMPZ_MAT_CHOL_EPS))
{
flint_printf("FAIL:\n");
flint_printf("A:\n");
fmpz_mat_print_pretty(A);
flint_printf("R:\n");
d_mat_print(R);
flint_printf("R^T:\n");
d_mat_print(Rt);
flint_printf("Btmp:\n");
d_mat_print(Btmp);
abort();
}
fmpz_mat_clear(A);
d_mat_clear(R);
d_mat_clear(Rt);
d_mat_clear(Atmp);
d_mat_clear(Btmp);
}
FLINT_TEST_CLEANUP(state);
flint_printf("PASS\n");
return EXIT_SUCCESS;
}
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