65 lines
1.8 KiB
C
65 lines
1.8 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) 2010 Sebastian Pancratz
|
||
|
|
|
||
|
|
******************************************************************************/
|
||
|
|
|
||
|
|
#include <gmp.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include "flint.h"
|
||
|
|
#include "fmpz.h"
|
||
|
|
#include "fmpz_vec.h"
|
||
|
|
#include "fmpq_poly.h"
|
||
|
|
|
||
|
|
int _fmpq_poly_is_canonical(const fmpz * poly, const fmpz_t den, slong len)
|
||
|
|
{
|
||
|
|
if (len)
|
||
|
|
{
|
||
|
|
int ans;
|
||
|
|
fmpz_t c;
|
||
|
|
|
||
|
|
if (fmpz_is_zero(poly + len - 1))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
if (fmpz_sgn(den) < 0)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
fmpz_init(c);
|
||
|
|
_fmpz_poly_content(c, poly, len);
|
||
|
|
fmpz_gcd(c, c, den);
|
||
|
|
ans = (*c == WORD(1));
|
||
|
|
fmpz_clear(c);
|
||
|
|
|
||
|
|
return ans;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
return (*den == WORD(1));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int fmpq_poly_is_canonical(const fmpq_poly_t poly)
|
||
|
|
{
|
||
|
|
return _fmpq_poly_is_canonical(poly->coeffs, poly->den, poly->length);
|
||
|
|
}
|
||
|
|
|