82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
/*=============================================================================
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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) 2010, 2011 Sebastian Pancratz
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******************************************************************************/
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#include "fmpz_poly_q.h"
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int fmpz_poly_q_evaluate(mpq_t rop, const fmpz_poly_q_t f, const mpq_t a)
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{
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if (flint_mpz_cmp_si(mpq_denref(a), 1)) /* a is not an integer */
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{
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mpq_t mpqnum, mpqden;
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mpq_init(mpqden);
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fmpz_poly_evaluate_mpq(mpqden, f->den, a);
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if (mpq_sgn(mpqden) == 0)
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{
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mpq_clear(mpqden);
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return 1;
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}
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mpq_init(mpqnum);
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fmpz_poly_evaluate_mpq(mpqnum, f->num, a);
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mpq_div(rop, mpqnum, mpqden);
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mpq_clear(mpqnum);
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mpq_clear(mpqden);
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return 0;
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}
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else /* a is an integer */
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{
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fmpz_t num, den, a2;
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fmpz_init(num);
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fmpz_init(den);
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fmpz_init(a2);
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fmpz_set_mpz(a2, mpq_numref(a));
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fmpz_poly_evaluate_fmpz(den, f->den, a2);
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if (fmpz_is_zero(den))
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{
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fmpz_clear(a2);
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fmpz_clear(num);
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fmpz_clear(den);
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return 1;
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}
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fmpz_poly_evaluate_fmpz(num, f->num, a2);
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fmpz_get_mpz(mpq_numref(rop), num);
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fmpz_get_mpz(mpq_denref(rop), den);
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mpq_canonicalize(rop);
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fmpz_clear(a2);
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fmpz_clear(num);
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fmpz_clear(den);
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return 0;
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}
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}
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