65 lines
1.9 KiB
C
65 lines
1.9 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) 2011 Sebastian Pancratz
|
|
|
|
******************************************************************************/
|
|
|
|
#include <gmp.h>
|
|
#include "flint.h"
|
|
#include "fmpz.h"
|
|
#include "fmpz_vec.h"
|
|
#include "fmpq_poly.h"
|
|
|
|
void fmpq_poly_get_slice(fmpq_poly_t rop, const fmpq_poly_t op, slong i, slong j)
|
|
{
|
|
i = FLINT_MAX(i, 0);
|
|
j = FLINT_MIN(j, op->length);
|
|
|
|
if (i < j)
|
|
{
|
|
slong k;
|
|
|
|
if (rop == op)
|
|
{
|
|
for (k = 0; k < i; k++)
|
|
fmpz_zero(rop->coeffs + k);
|
|
for (k = j; k < rop->length; k++)
|
|
fmpz_zero(rop->coeffs + k);
|
|
fmpq_poly_canonicalise(rop);
|
|
}
|
|
else
|
|
{
|
|
fmpq_poly_fit_length(rop, j);
|
|
_fmpq_poly_set_length(rop, j);
|
|
|
|
_fmpz_vec_set(rop->coeffs + i, op->coeffs + i, j - i);
|
|
fmpz_set(rop->den, op->den);
|
|
fmpq_poly_canonicalise(rop);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
fmpq_poly_zero(rop);
|
|
}
|
|
}
|
|
|