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https://github.com/vale981/arb
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55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/*=============================================================================
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This file is part of ARB.
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ARB 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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ARB 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 ARB; 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 "fmpz_holonomic.h"
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void
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fmpz_holonomic_seq_reverse(fmpz_holonomic_t res, const fmpz_holonomic_t op)
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{
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long i, j, r;
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r = fmpz_holonomic_order(op);
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fmpz_holonomic_set(res, op);
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if (r > 0)
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{
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fmpz c = r;
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for (i = 0; i <= r; i++)
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for (j = 1; j < fmpz_poly_length(res->coeffs + i); j += 2)
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fmpz_neg((res->coeffs + i)->coeffs + j,
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(res->coeffs + i)->coeffs + j);
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for (i = 0; i <= r; i++)
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fmpz_poly_taylor_shift(res->coeffs + i, res->coeffs + i, &c);
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for (i = 0; i <= r / 2; i++)
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fmpz_poly_swap(res->coeffs + i, res->coeffs + r - i);
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fmpz_holonomic_normalise_sign(res);
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}
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}
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