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https://github.com/vale981/arb
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53 lines
1.8 KiB
C
53 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_mul(fmpz_holonomic_t res, const fmpz_holonomic_t op1, const fmpz_holonomic_t op2)
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{
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if (op1->length <= 1 || op2->length <= 1)
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{
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fmpz_holonomic_one(res);
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}
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else if (op1->length != 2 || op2->length != 2)
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{
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printf("not implemented: product of non-hypergeometric sequences\n");
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abort();
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}
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else
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{
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fmpz_holonomic_fit_length(res, 2);
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/* todo: better to compute gcd first? */
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fmpz_poly_mul(res->coeffs + 0, op1->coeffs + 0, op2->coeffs + 0);
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fmpz_poly_mul(res->coeffs + 1, op1->coeffs + 1, op2->coeffs + 1);
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fmpz_poly_neg(res->coeffs + 1, res->coeffs + 1);
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_fmpz_holonomic_set_length(res, 2);
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fmpz_holonomic_seq_normalise(res);
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}
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}
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