71 lines
2.0 KiB
C
71 lines
2.0 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) 2010 Sebastian Pancratz
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******************************************************************************/
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#include <gmp.h>
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#include <stdlib.h>
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#include "flint.h"
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#include "fmpz.h"
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#include "fmpz_vec.h"
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#include "fmpq_poly.h"
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void _fmpq_poly_canonicalise(fmpz * poly, fmpz_t den, slong len)
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{
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if (*den == WORD(1))
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return;
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if (*den == WORD(-1))
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{
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_fmpz_vec_neg(poly, poly, len);
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fmpz_one(den);
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}
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else if (len == 0)
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{
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fmpz_one(den);
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}
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else
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{
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fmpz_t gcd;
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fmpz_init(gcd);
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_fmpz_vec_content(gcd, poly, len);
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if (*gcd != WORD(1))
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fmpz_gcd(gcd, gcd, den);
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if (fmpz_sgn(den) < 0)
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fmpz_neg(gcd, gcd);
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if (*gcd != WORD(1))
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{
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_fmpz_vec_scalar_divexact_fmpz(poly, poly, len, gcd);
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fmpz_divexact(den, den, gcd);
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}
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fmpz_clear(gcd);
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}
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}
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void fmpq_poly_canonicalise(fmpq_poly_t poly)
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{
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_fmpq_poly_normalise(poly);
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_fmpq_poly_canonicalise(poly->coeffs, poly->den, poly->length);
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}
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