67 lines
1.9 KiB
C
67 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) 2012 Fredrik Johansson
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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_poly.h"
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int
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_fmpz_poly_sqrt(fmpz * res, const fmpz * poly, slong len)
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{
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return _fmpz_poly_sqrt_classical(res, poly, len);
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}
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int
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fmpz_poly_sqrt(fmpz_poly_t b, const fmpz_poly_t a)
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{
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slong blen, len = a->length;
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int result;
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if (len % 2 == 0)
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{
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fmpz_poly_zero(b);
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return len == 0;
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}
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if (b == a)
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{
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fmpz_poly_t tmp;
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fmpz_poly_init(tmp);
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result = fmpz_poly_sqrt(tmp, a);
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fmpz_poly_swap(b, tmp);
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fmpz_poly_clear(tmp);
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return result;
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}
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blen = len / 2 + 1;
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fmpz_poly_fit_length(b, blen);
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_fmpz_poly_set_length(b, blen);
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result = _fmpz_poly_sqrt(b->coeffs, a->coeffs, len);
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if (!result)
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_fmpz_poly_set_length(b, 0);
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return result;
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}
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