58 lines
1.7 KiB
C
58 lines
1.7 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_number_of_partitions_vec(fmpz * res, slong len)
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{
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fmpz * tmp;
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slong k, n;
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if (len < 1)
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return;
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tmp = _fmpz_vec_init(len);
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tmp[0] = WORD(1);
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for (n = k = 1; n + 4*k + 2 < len; k += 2)
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{
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tmp[n] = WORD(-1);
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tmp[n + k] = WORD(-1);
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tmp[n + 3*k + 1] = WORD(1);
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tmp[n + 4*k + 2] = WORD(1);
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n += 6*k + 5;
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}
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if (n < len) tmp[n] = WORD(-1);
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if (n + k < len) tmp[n + k] = WORD(-1);
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if (n + 3*k + 1 < len) tmp[n + 3*k + 1] = WORD(1);
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_fmpz_poly_inv_series(res, tmp, len);
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_fmpz_vec_clear(tmp, len);
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}
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