87 lines
2.5 KiB
C
87 lines
2.5 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 <limits.h>
|
||
|
|
#include <gmp.h>
|
||
|
|
#include "flint.h"
|
||
|
|
#include "fmpz.h"
|
||
|
|
#include "fmpz_vec.h"
|
||
|
|
#include "fmpq_poly.h"
|
||
|
|
|
||
|
|
void _fmpq_poly_scalar_mul_si(fmpz * rpoly, fmpz_t rden,
|
||
|
|
const fmpz * poly, const fmpz_t den, slong len,
|
||
|
|
slong c)
|
||
|
|
{
|
||
|
|
fmpz_t gcd; /* GCD( den, c ) */
|
||
|
|
|
||
|
|
if (c == 0)
|
||
|
|
{
|
||
|
|
_fmpz_vec_zero(rpoly, len);
|
||
|
|
fmpz_one(rden);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
fmpz_init(gcd);
|
||
|
|
fmpz_set_si(gcd, c);
|
||
|
|
fmpz_gcd(gcd, gcd, den);
|
||
|
|
if (*gcd == WORD(1))
|
||
|
|
{
|
||
|
|
_fmpz_vec_scalar_mul_si(rpoly, poly, len, c);
|
||
|
|
fmpz_set(rden, den);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if (c > WORD_MIN || fmpz_cmp_ui(gcd, - (ulong) WORD_MIN))
|
||
|
|
{
|
||
|
|
slong g = fmpz_get_si(gcd);
|
||
|
|
|
||
|
|
_fmpz_vec_scalar_mul_si(rpoly, poly, len, c / g);
|
||
|
|
fmpz_divexact_si(rden, den, g);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
_fmpz_vec_neg(rpoly, poly, len);
|
||
|
|
fmpz_divexact_ui(rden, den, - (ulong) WORD_MIN);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
fmpz_clear(gcd);
|
||
|
|
}
|
||
|
|
|
||
|
|
void fmpq_poly_scalar_mul_si(fmpq_poly_t rop, const fmpq_poly_t op, slong c)
|
||
|
|
{
|
||
|
|
if (c == 0 || fmpq_poly_is_zero(op))
|
||
|
|
{
|
||
|
|
fmpq_poly_zero(rop);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
fmpq_poly_fit_length(rop, op->length);
|
||
|
|
_fmpq_poly_set_length(rop, op->length);
|
||
|
|
|
||
|
|
_fmpq_poly_scalar_mul_si(rop->coeffs, rop->den,
|
||
|
|
op->coeffs, op->den, op->length, c);
|
||
|
|
}
|
||
|
|
|