mirror of
https://github.com/vale981/arb
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38 lines
1,015 B
C
38 lines
1,015 B
C
/*
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Copyright (C) 2017 Fredrik Johansson
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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 it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version. See <http://www.gnu.org/licenses/>.
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*/
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#include "arb_fmpz_poly.h"
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void
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arb_fmpz_poly_deflate(fmpz_poly_t result, const fmpz_poly_t input, ulong deflation)
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{
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slong res_length, i;
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if (deflation == 0)
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{
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flint_printf("Exception (fmpz_poly_deflate). Division by zero.\n");
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flint_abort();
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}
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if (input->length <= 1 || deflation == 1)
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{
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fmpz_poly_set(result, input);
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return;
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}
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res_length = (input->length - 1) / deflation + 1;
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fmpz_poly_fit_length(result, res_length);
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for (i = 0; i < res_length; i++)
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fmpz_set(result->coeffs + i, input->coeffs + i*deflation);
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result->length = res_length;
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}
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