mirror of
https://github.com/vale981/arb
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76 lines
2.2 KiB
C
76 lines
2.2 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_shift_fmpq(fmpz_holonomic_t res, const fmpz_holonomic_t op, const fmpq_t s)
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{
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long i, j, d;
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if (fmpz_is_one(fmpq_denref(s)))
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{
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fmpz_holonomic_shift_fmpz(res, op, fmpq_numref(s));
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}
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else
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{
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fmpz_t Qpow;
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fmpz_poly_t spoly;
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fmpz C[2];
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if (res != op)
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fmpz_holonomic_set(res, op);
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d = fmpz_holonomic_degree(res);
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C[0] = *fmpq_numref(s);
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C[1] = *fmpq_denref(s);
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spoly->coeffs = C;
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spoly->length = 2;
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spoly->alloc = 2;
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fmpz_init(Qpow);
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fmpz_one(Qpow);
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for (j = d - 1; j >= 0; j--)
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{
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fmpz_mul(Qpow, Qpow, fmpq_denref(s));
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for (i = 0; i < res->length; i++)
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{
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fmpz_poly_struct * poly = res->coeffs + i;
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if (j < poly->length)
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fmpz_mul(poly->coeffs + j, poly->coeffs + j, Qpow);
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}
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}
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for (i = 0; i < res->length; i++)
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fmpz_poly_compose(res->coeffs + i, res->coeffs + i, spoly);
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fmpz_clear(Qpow);
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}
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}
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