int main (void)
{
double t;
nmod_poly_t f, g, h;
for (int i= 15001;i < 16000; i++)
{
nmod_poly_init2 (f, 17, i/2+1);
nmod_poly_init2 (g, 17, i+1);
nmod_poly_set_coeff_ui (f, i/2, 1);
nmod_poly_set_coeff_ui (f, 1, 1);
nmod_poly_set_coeff_ui (f, 0, ((i%17)*(i%17)+3) % 17);
nmod_poly_set_coeff_ui (g, i, 1);
nmod_poly_set_coeff_ui (g, i/2+1, 1);
nmod_poly_set_coeff_ui (g, 1, ((i % 17)+1)%17);
nmod_poly_set_coeff_ui (g, 0, 15);
nmod_poly_init (h, 17);
nmod_poly_gcd (h, f, g);
if (!nmod_poly_is_one (h))
{
flint_printf ("i= %d\n", i);
nmod_poly_factor_t factors;
nmod_poly_factor_init (factors);
t= clock();
nmod_poly_factor (factors, h);
t = (clock() - t) / CLOCKS_PER_SEC;
flint_printf("factorization %.2lf\n", t);
nmod_poly_factor_clear (factors);
}
nmod_poly_clear (f);
nmod_poly_clear (g);
nmod_poly_clear (h);
}
return EXIT_SUCCESS;
}
int
main(void)
{
int iter;
flint_rand_t state;
flint_randinit(state);
printf("factor....");
fflush(stdout);
/* Default algorithm */
for (iter = 0; iter < 100; iter++)
{
int result = 1;
nmod_poly_t pol1, poly, quot, rem, product;
nmod_poly_factor_t res;
mp_limb_t modulus, lead = 1;
long length, num, i, j;
ulong exp[5], prod1;
modulus = n_randtest_prime(state, 0);
nmod_poly_init(pol1, modulus);
nmod_poly_init(poly, modulus);
nmod_poly_init(quot, modulus);
nmod_poly_init(rem, modulus);
nmod_poly_zero(pol1);
nmod_poly_set_coeff_ui(pol1, 0, 1);
length = n_randint(state, 7) + 2;
do
{
nmod_poly_randtest(poly, state, length);
if (poly->length)
nmod_poly_make_monic(poly, poly);
}
while ((!nmod_poly_is_irreducible(poly)) || (poly->length < 2));
exp[0] = n_randint(state, 30) + 1;
prod1 = exp[0];
for (i = 0; i < exp[0]; i++)
nmod_poly_mul(pol1, pol1, poly);
num = n_randint(state, 5) + 1;
for (i = 1; i < num; i++)
{
do
{
length = n_randint(state, 7) + 2;
nmod_poly_randtest(poly, state, length);
if (poly->length)
{
nmod_poly_make_monic(poly, poly);
nmod_poly_divrem(quot, rem, pol1, poly);
}
}
while ((!nmod_poly_is_irreducible(poly)) ||
(poly->length < 2) || (rem->length == 0));
exp[i] = n_randint(state, 30) + 1;
prod1 *= exp[i];
for (j = 0; j < exp[i]; j++)
nmod_poly_mul(pol1, pol1, poly);
}
nmod_poly_factor_init(res);
switch (n_randint(state, 3))
{
case 0:
lead = nmod_poly_factor(res, pol1);
break;
case 1:
lead = nmod_poly_factor_with_berlekamp(res, pol1);
break;
case 2:
if (modulus == 2)
lead = nmod_poly_factor(res, pol1);
else
lead = nmod_poly_factor_with_cantor_zassenhaus(res, pol1);
break;
}
result &= (res->num == num);
if (!result)
{
printf("Error: number of factors incorrect, %ld, %ld\n",
res->num, num);
abort();
}
nmod_poly_init(product, pol1->mod.n);
nmod_poly_set_coeff_ui(product, 0, 1);
for (i = 0; i < res->num; i++)
for (j = 0; j < res->exp[i]; j++)
nmod_poly_mul(product, product, res->p + i);
nmod_poly_scalar_mul_nmod(product, product, lead);
result &= nmod_poly_equal(pol1, product);
if (!result)
{
printf("Error: product of factors does not equal original polynomial\n");
nmod_poly_print(pol1); printf("\n");
nmod_poly_print(product); printf("\n");
abort();
}
nmod_poly_clear(product);
nmod_poly_clear(quot);
nmod_poly_clear(rem);
nmod_poly_clear(pol1);
nmod_poly_clear(poly);
nmod_poly_factor_clear(res);
}
/* Test deflation trick */
for (iter = 0; iter < 100; iter++)
{
nmod_poly_t pol1, poly, quot, rem;
nmod_poly_factor_t res, res2;
mp_limb_t modulus;
long length, num, i, j;
long exp[5], prod1;
ulong inflation;
int found;
do {
modulus = n_randtest_prime(state, 0);
} while (modulus == 2); /* To compare with CZ */
nmod_poly_init(pol1, modulus);
nmod_poly_init(poly, modulus);
nmod_poly_init(quot, modulus);
nmod_poly_init(rem, modulus);
nmod_poly_zero(pol1);
nmod_poly_set_coeff_ui(pol1, 0, 1);
inflation = n_randint(state, 7) + 1;
length = n_randint(state, 7) + 2;
do
{
nmod_poly_randtest(poly, state, length);
if (poly->length)
nmod_poly_make_monic(poly, poly);
}
while ((!nmod_poly_is_irreducible(poly)) || (poly->length < 2));
nmod_poly_inflate(poly, poly, inflation);
exp[0] = n_randint(state, 6) + 1;
prod1 = exp[0];
for (i = 0; i < exp[0]; i++)
nmod_poly_mul(pol1, pol1, poly);
num = n_randint(state, 5) + 1;
for (i = 1; i < num; i++)
{
do
{
length = n_randint(state, 6) + 2;
nmod_poly_randtest(poly, state, length);
if (poly->length)
{
nmod_poly_make_monic(poly, poly);
nmod_poly_divrem(quot, rem, pol1, poly);
}
}
while ((!nmod_poly_is_irreducible(poly)) ||
(poly->length < 2) || (rem->length == 0));
exp[i] = n_randint(state, 6) + 1;
prod1 *= exp[i];
nmod_poly_inflate(poly, poly, inflation);
for (j = 0; j < exp[i]; j++)
nmod_poly_mul(pol1, pol1, poly);
}
nmod_poly_factor_init(res);
nmod_poly_factor_init(res2);
switch (n_randint(state, 3))
{
case 0:
nmod_poly_factor(res, pol1);
break;
case 1:
nmod_poly_factor_with_berlekamp(res, pol1);
break;
case 2:
nmod_poly_factor_with_cantor_zassenhaus(res, pol1);
break;
}
nmod_poly_factor_cantor_zassenhaus(res2, pol1);
if (res->num != res2->num)
{
printf("FAIL: different number of factors found\n");
abort();
}
for (i = 0; i < res->num; i++)
{
found = 0;
for (j = 0; j < res2->num; j++)
{
if (nmod_poly_equal(res->p + i, res2->p + j) &&
res->exp[i] == res2->exp[j])
{
found = 1;
break;
}
}
if (!found)
{
printf("FAIL: factor not found\n");
abort();
}
}
nmod_poly_clear(quot);
nmod_poly_clear(rem);
nmod_poly_clear(pol1);
nmod_poly_clear(poly);
nmod_poly_factor_clear(res);
nmod_poly_factor_clear(res2);
}
flint_randclear(state);
printf("PASS\n");
return 0;
}
