128 lines
3.2 KiB
C
128 lines
3.2 KiB
C
/*=============================================================================
|
|
|
|
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) 2011, 2012 Sebastian Pancratz
|
|
Copyright (C) 2009 William Hart
|
|
|
|
******************************************************************************/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "flint.h"
|
|
#include "padic_poly.h"
|
|
|
|
void padic_poly_randtest_val(padic_poly_t f, flint_rand_t state,
|
|
slong val, slong len, const padic_ctx_t ctx)
|
|
{
|
|
const slong N = padic_poly_prec(f);
|
|
|
|
if (len == 0)
|
|
return;
|
|
|
|
if (val >= N)
|
|
{
|
|
padic_poly_zero(f);
|
|
}
|
|
else
|
|
{
|
|
slong i;
|
|
fmpz_t pow;
|
|
int alloc;
|
|
|
|
f->val = val;
|
|
|
|
padic_poly_fit_length(f, len);
|
|
|
|
alloc = _padic_ctx_pow_ui(pow, N - f->val, ctx);
|
|
|
|
for (i = 0; i < len; i++)
|
|
fmpz_randm(f->coeffs + i, state, pow);
|
|
|
|
if (alloc)
|
|
fmpz_clear(pow);
|
|
|
|
for (i = 0; i < len; i++)
|
|
if (!fmpz_divisible(f->coeffs + i, ctx->p))
|
|
break;
|
|
if (i == len)
|
|
fmpz_one(f->coeffs + n_randint(state, len));
|
|
|
|
_padic_poly_set_length(f, len);
|
|
_padic_poly_normalise(f);
|
|
|
|
padic_poly_reduce(f, ctx);
|
|
}
|
|
}
|
|
|
|
void padic_poly_randtest(padic_poly_t f, flint_rand_t state,
|
|
slong len, const padic_ctx_t ctx)
|
|
{
|
|
const slong N = padic_poly_prec(f);
|
|
|
|
slong min, max, val;
|
|
|
|
if (N > 0)
|
|
{
|
|
min = - ((N + 9) / 10);
|
|
max = N;
|
|
}
|
|
else if (N < 0)
|
|
{
|
|
min = N - ((-N + 9) / 10);
|
|
max = N;
|
|
}
|
|
else /* N == 0 */
|
|
{
|
|
min = -10;
|
|
max = 0;
|
|
}
|
|
|
|
val = n_randint(state, max - min) + min;
|
|
|
|
padic_poly_randtest_val(f, state, val, len, ctx);
|
|
}
|
|
|
|
void padic_poly_randtest_not_zero(padic_poly_t f, flint_rand_t state,
|
|
slong len, const padic_ctx_t ctx)
|
|
{
|
|
slong i;
|
|
|
|
if (len == 0)
|
|
{
|
|
flint_printf("Exception (padic_poly_randtest_not_zero). len == 0.\n");
|
|
abort();
|
|
}
|
|
|
|
padic_poly_randtest(f, state, len, ctx);
|
|
for (i = 0; !padic_poly_is_zero(f) && (i < 10); i++)
|
|
padic_poly_randtest(f, state, len, ctx);
|
|
|
|
if (padic_poly_is_zero(f))
|
|
{
|
|
padic_poly_fit_length(f, 1);
|
|
_padic_poly_set_length(f, 1);
|
|
fmpz_one(f->coeffs + 0);
|
|
f->val = f->N - 1;
|
|
}
|
|
}
|
|
|