58 lines
1.6 KiB
C
58 lines
1.6 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) 2011 Fredrik Johansson
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******************************************************************************/
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#include "arith.h"
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void
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arith_bell_number_vec_recursive(fmpz * b, slong n)
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{
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slong i, k;
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fmpz * t;
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if (n < BELL_NUMBER_TAB_SIZE)
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{
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for (i = 0; i < n; i++)
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fmpz_set_ui(b + i, bell_number_tab[i]);
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return;
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}
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n -= 1;
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t = _fmpz_vec_init(n);
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fmpz_one(t);
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fmpz_one(b);
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fmpz_one(b + 1);
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for (i = 1; i < n; i++)
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{
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fmpz_set(t + i, t);
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for (k = i; k > 0; k--)
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fmpz_add(t + k - 1, t + k - 1, t + k);
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fmpz_set(b + i + 1, t);
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}
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_fmpz_vec_clear(t, n);
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}
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