DiscreteRandomGeneratorZipf.h

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/*
 * Copyright (C) 2007-2015 Hypertable, Inc.
 *
 * This file is part of Hypertable.
 *
 * Hypertable is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or any later version.
 *
 * Hypertable is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#ifndef HYPERTABLE_DISCRETERANDOMGENERATORZIPF_H
#define HYPERTABLE_DISCRETERANDOMGENERATORZIPF_H

#include "Common/Compat.h"

#include <vector>
#include <cmath>

#include "DiscreteRandomGenerator.h"

namespace Hypertable {

  class DiscreteRandomGeneratorZipf: public DiscreteRandomGenerator {
  public:
    DiscreteRandomGeneratorZipf(double s = 0.8);

    double pmf(uint64_t val);

  private:
    bool m_initialized;

    double m_s;

    double m_norm;
  };

} // namespace Hypertable

#endif // HYPERTABLE_DISCRETERANDOMGENERATORZIPF_H