TruncatedExponentialDiscreteDistribution.cpp

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//
// File: TruncatedExponentialDiscreteDistribution.cpp
// Created by: Julien Dutheil
// Created on: Fri Jan 25 15:24 2008
//

/*
   Copyright or © or Copr. Bio++ Development Team, (November 17, 2004)

   This software is a computer program whose purpose is to provide classes
   for numerical calculus.

   This software is governed by the CeCILL  license under French law and
   abiding by the rules of distribution of free software.  You can  use,
   modify and/ or redistribute the software under the terms of the CeCILL
   license as circulated by CEA, CNRS and INRIA at the following URL
   "http://www.cecill.info".

   As a counterpart to the access to the source code and  rights to copy,
   modify and redistribute granted by the license, users are provided only
   with a limited warranty  and the software's author,  the holder of the
   economic rights,  and the successive licensors  have only  limited
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   In this respect, the user's attention is drawn to the risks associated
   with loading,  using,  modifying and/or developing or reproducing the
   software by the user in light of its specific status of free software,
   that may mean  that it is complicated to manipulate,  and  that  also
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 */

#include "TruncatedExponentialDiscreteDistribution.h"
#include "../Random/RandomTools.h"
#include "../../Utils/MapTools.h"

using namespace bpp;

// From the STL:
#include <cmath>

using namespace std;

TruncatedExponentialDiscreteDistribution::TruncatedExponentialDiscreteDistribution(size_t n, double lambda, double truncationPoint) :
  AbstractParameterAliasable("TruncExponential."),
  AbstractDiscreteDistribution(n, "TruncExponential."),
  lambda_(lambda),
  tp_(truncationPoint),
  cond_(1-exp(-lambda_*tp_))
{
  addParameter_(new Parameter("TruncExponential.tp", truncationPoint, &Parameter::R_PLUS));
  addParameter_(new Parameter("TruncExponential.lambda", lambda,  &Parameter::R_PLUS));

  intMinMax_.setLowerBound(0, true);
  intMinMax_.setUpperBound(tp_, false);

  discretize();
}

/******************************************************************************/

void TruncatedExponentialDiscreteDistribution::fireParameterChanged(const ParameterList& parameters)
{
  AbstractDiscreteDistribution::fireParameterChanged(parameters);
  lambda_ = getParameterValue("lambda");
  tp_ = getParameterValue("tp");

  intMinMax_.setUpperBound(tp_, false);
  cond_=1-exp(-lambda_*tp_);
  
  discretize();
}

/******************************************************************************/

void TruncatedExponentialDiscreteDistribution::restrictToConstraint(const Constraint& c)
{
  AbstractDiscreteDistribution::restrictToConstraint(c);

  getParameter_("tp").setConstraint(intMinMax_.clone(), true);
}