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/*
Copyright (C) 2010 William Hart
Copyright (C) 2011 Fredrik Johansson
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "nmod_poly.h"
void
nmod_poly_inflate(nmod_poly_t result, const nmod_poly_t input, slong inflation)
{
if (input->length <= 1 || inflation == 1)
{
nmod_poly_set(result, input);
}
else if (inflation == 0)
{
ulong v = nmod_poly_evaluate_nmod(input, 1);
nmod_poly_zero(result);
nmod_poly_set_coeff_ui(result, 0, v);
}
else
{
slong i, j, res_length = (input->length - 1) * inflation + 1;
nmod_poly_fit_length(result, res_length);
for (i = input->length - 1; i > 0; i--)
{
result->coeffs[i * inflation] = input->coeffs[i];
for (j = i * inflation - 1; j > (i - 1) * inflation; j--)
result->coeffs[j] = 0;
}
result->coeffs[0] = input->coeffs[0];
result->length = res_length;
}
}