pqc/external/flint-2.4.3/fmpz_poly/test/t-resultant.c

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2014-05-18 22:03:37 +00:00
/*=============================================================================
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) 2009 William Hart
Copyright (C) 2010 Sebastian Pancratz
******************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <gmp.h>
#include "flint.h"
#include "fmpz.h"
#include "fmpz_poly.h"
#include "ulong_extras.h"
int
main(void)
{
int i, result;
FLINT_TEST_INIT(state);
flint_printf("resultant....");
fflush(stdout);
/* Just one specific test */
{
fmpz_poly_t f, g;
fmpz_t a, b;
fmpz_poly_init(f);
fmpz_poly_init(g);
fmpz_init(a);
fmpz_init(b);
fmpz_poly_set_str(f, "11 -15 -2 -2 17 0 0 6 0 -5 1 -1");
fmpz_poly_set_str(g, "9 2 1 1 1 1 1 0 -1 -2");
fmpz_poly_resultant(a, f, g);
fmpz_set_str(b, "-44081924855067", 10);
result = (fmpz_equal(a, b));
if (!result)
{
flint_printf("FAIL:\n");
flint_printf("f = "), fmpz_poly_print(f), flint_printf("\n\n");
flint_printf("g = "), fmpz_poly_print(g), flint_printf("\n\n");
flint_printf("res(f, h) = "), fmpz_print(a), flint_printf("\n\n");
abort();
}
fmpz_poly_clear(f);
fmpz_poly_clear(g);
fmpz_clear(a);
fmpz_clear(b);
}
/* Check that R(fg, h) = R(f, h) R(g, h) */
for (i = 0; i < 100 * flint_test_multiplier(); i++)
{
fmpz_t a, b, c, d;
fmpz_poly_t f, g, h, p;
fmpz_init(a);
fmpz_init(b);
fmpz_init(c);
fmpz_init(d);
fmpz_poly_init(f);
fmpz_poly_init(g);
fmpz_poly_init(h);
fmpz_poly_init(p);
fmpz_poly_randtest(f, state, n_randint(state, 50), 100);
fmpz_poly_randtest(g, state, n_randint(state, 50), 100);
fmpz_poly_randtest(h, state, n_randint(state, 10), 100);
fmpz_poly_resultant(a, f, h);
fmpz_poly_resultant(b, g, h);
fmpz_mul(c, a, b);
fmpz_poly_mul(p, f, g);
fmpz_poly_resultant(d, p, h);
result = (fmpz_equal(c, d));
if (!result)
{
flint_printf("FAIL:\n");
flint_printf("f = "), fmpz_poly_print(f), flint_printf("\n\n");
flint_printf("g = "), fmpz_poly_print(g), flint_printf("\n\n");
flint_printf("h = "), fmpz_poly_print(h), flint_printf("\n\n");
flint_printf("res(f, h) = "), fmpz_print(a), flint_printf("\n\n");
flint_printf("res(g, h) = "), fmpz_print(b), flint_printf("\n\n");
flint_printf("res(fg, h) = "), fmpz_print(d), flint_printf("\n\n");
abort();
}
fmpz_clear(a);
fmpz_clear(b);
fmpz_clear(c);
fmpz_clear(d);
fmpz_poly_clear(f);
fmpz_poly_clear(g);
fmpz_poly_clear(h);
fmpz_poly_clear(p);
}
FLINT_TEST_CLEANUP(state);
flint_printf("PASS\n");
return 0;
}