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