104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
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/*=============================================================================
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This file is part of FLINT.
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FLINT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FLINT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FLINT; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2011 Sebastian Pancratz
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******************************************************************************/
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#include "padic.h"
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#define PADIC_RANDTEST_TRIES 10
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void padic_randtest(padic_t rop, flint_rand_t state, const padic_ctx_t ctx)
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{
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const slong N = padic_prec(rop);
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slong min, max;
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fmpz_t pow;
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int alloc;
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if (N > 0)
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{
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min = - ((N + 9) / 10);
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max = N;
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}
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else if (N < 0)
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{
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min = N - ((-N + 9) / 10);
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max = N;
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}
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else /* ctx->N == 0 */
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{
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min = -10;
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max = 0;
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}
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padic_val(rop) = n_randint(state, max - min) + min;
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alloc = _padic_ctx_pow_ui(pow, N - padic_val(rop), ctx);
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fmpz_randm(padic_unit(rop), state, pow);
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_padic_canonicalise(rop, ctx);
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if (alloc)
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fmpz_clear(pow);
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}
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void padic_randtest_not_zero(padic_t rop, flint_rand_t state,
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const padic_ctx_t ctx)
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{
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slong i;
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padic_randtest(rop, state, ctx);
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for (i = 1; !padic_is_zero(rop) && i < PADIC_RANDTEST_TRIES; i++)
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padic_randtest(rop, state, ctx);
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if (padic_is_zero(rop))
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{
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fmpz_one(padic_unit(rop));
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padic_val(rop) = padic_prec(rop) - 1;
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}
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}
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void padic_randtest_int(padic_t rop, flint_rand_t state,
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const padic_ctx_t ctx)
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{
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const slong N = padic_prec(rop);
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if (N <= 0)
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{
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padic_zero(rop);
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}
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else
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{
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fmpz_t pow;
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int alloc;
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padic_val(rop) = n_randint(state, N);
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alloc = _padic_ctx_pow_ui(pow, N - padic_val(rop), ctx);
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fmpz_randm(padic_unit(rop), state, pow);
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_padic_canonicalise(rop, ctx);
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if (alloc)
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fmpz_clear(pow);
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}
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}
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