58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
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/*=============================================================================
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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 <math.h>
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#include "arith.h"
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double
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arith_dedekind_sum_coprime_d(double h, double k)
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{
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double a, b, t, s, sign;
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if (k <= 2)
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return 0.0;
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a = k;
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b = h;
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s = 0.0;
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sign = 1.0;
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while (b > 0)
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{
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s += sign * (1.0 + a*a + b*b) / (a * b);
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t = fmod(a, b);
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a = b;
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b = t;
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sign = -sign;
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}
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s *= (1./12);
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if (sign < 0)
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s -= 0.25;
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return s;
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}
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