59 lines
2.0 KiB
C
59 lines
2.0 KiB
C
/*=============================================================================
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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) 2010 William Hart
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Copyright (C) 2011 Fredrik Johansson
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******************************************************************************/
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#include "nmod_poly.h"
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#include "ulong_extras.h"
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void
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nmod_poly_inflate(nmod_poly_t result, const nmod_poly_t input, ulong inflation)
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{
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if (input->length <= 1 || inflation == 1)
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{
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nmod_poly_set(result, input);
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}
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else if (inflation == 0)
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{
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mp_limb_t v = nmod_poly_evaluate_nmod(input, 1);
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nmod_poly_zero(result);
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nmod_poly_set_coeff_ui(result, 0, v);
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}
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else
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{
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slong i, j, res_length = (input->length - 1) * inflation + 1;
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nmod_poly_fit_length(result, res_length);
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for (i = input->length - 1; i > 0; i--)
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{
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result->coeffs[i * inflation] = input->coeffs[i];
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for (j = i * inflation - 1; j > (i - 1) * inflation; j--)
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result->coeffs[j] = 0;
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}
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result->coeffs[0] = input->coeffs[0];
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result->length = res_length;
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}
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}
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