powerlawdistribution.h

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/*

  This file is a part of GRALE, a library to facilitate the simulation
  and inversion of gravitational lenses.

  Copyright (C) 2008-2012 Jori Liesenborgs

  Contact: jori.liesenborgs@gmail.com
  
  This program 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 2 of the License, or
  (at your option) any later version.
  
  This program 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 St, Fifth Floor, Boston, MA  02110-1301  USA
  
*/

#ifndef GRALE_POWERLAWDISTRIBUTION_H

#define GRALE_POWERLAWDISTRIBUTION_H

#include "graleconfig.h"
#include "probabilitydistribution.h"

namespace grale
{

// NOTE: doesn't work for alpha = -1, use JeffreysDistribution instead

class GRALE_IMPORTEXPORT PowerLawDistribution : public ProbabilityDistribution
{
public:
        PowerLawDistribution(double min, double max, double alpha, const mogal::RandomNumberGenerator *pRndGen);
        ~PowerLawDistribution();
        double pickNumber() const;
private:
        double m_minValuePower, m_maxMinusMinPower;
        double m_oneOverAlphaPlusOne;
};

} // end namespace

#endif // GRALE_POWERLAWDISTRIBUTION_H