0bbcb7f35d
We do not need these functions in Spot. * spot/misc/random.cc, spot/misc/random.hh (bmrand, prand): Remove. * NEWS: Mention it.
90 lines
2.2 KiB
C++
90 lines
2.2 KiB
C++
// -*- coding: utf-8 -*-
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// Copyright (C) 2011-2015, 2017 Laboratoire de Recherche et
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// Développement de l'Epita (LRDE).
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// Copyright (C) 2004 Laboratoire d'Informatique de Paris 6 (LIP6),
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// département Systèmes Répartis Coopératifs (SRC), Université Pierre
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// et Marie Curie.
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//
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// This file is part of Spot, a model checking library.
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//
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// Spot is free software; you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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//
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// Spot is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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// License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "config.h"
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#include <spot/misc/random.hh>
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#include <random>
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namespace spot
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{
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static std::mt19937 gen;
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void
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srand(unsigned int seed)
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{
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gen.seed(seed);
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}
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double
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drand()
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{
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return gen() / (1.0 + gen.max());
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}
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int
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mrand(int max)
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{
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return static_cast<int>(max * drand());
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}
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int
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rrand(int min, int max)
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{
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return min + static_cast<int>((max - min + 1) * drand());
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}
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double
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nrand()
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{
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const double r = drand();
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const double lim = 1.e-20;
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if (r < lim)
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return -1./lim;
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if (r > 1.0 - lim)
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return 1./lim;
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double t;
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if (r < 0.5)
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t = sqrt(-2.0 * log(r));
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else
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t = sqrt(-2.0 * log(1.0 - r));
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const double p0 = 0.322232431088;
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const double p1 = 1.0;
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const double p2 = 0.342242088547;
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const double p3 = 0.204231210245e-1;
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const double p4 = 0.453642210148e-4;
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const double q0 = 0.099348462606;
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const double q1 = 0.588581570495;
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const double q2 = 0.531103462366;
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const double q3 = 0.103537752850;
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const double q4 = 0.385607006340e-2;
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const double p = p0 + t * (p1 + t * (p2 + t * (p3 + t * p4)));
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const double q = q0 + t * (q1 + t * (q2 + t * (q3 + t * q4)));
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if (r < 0.5)
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return (p / q) - t;
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else
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return t - (p / q);
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}
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}
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