discrete_random_variable.h

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//
// Authors:
// Guillermo Casas gcasas@cimne-upc.edu
//
 
#ifndef DISCRETE_RANDOM_VARIABLE_H
#define DISCRETE_RANDOM_VARIABLE_H
 
 
// System includes
#include <string>
#include <numeric>
#include <iostream>
#include <random>
 
// Project includes
#include "random_variable.h"
 
namespace Kratos {
 
class KRATOS_API(DEM_APPLICATION) DiscreteRandomVariable: public RandomVariable {
 
public:
 
    KRATOS_CLASS_POINTER_DEFINITION(DiscreteRandomVariable);
 
    DiscreteRandomVariable();
    DiscreteRandomVariable(const Parameters rParameters);
    DiscreteRandomVariable(const Parameters rParameters, const int seed);
 
    double Sample() override;
    double ProbabilityDensity(const double x);
    double GetMean() override;
 
    std::string Info() const override
    {
        std::stringstream buffer;
        buffer << "DiscreteRandomVariable" ;
        return buffer.str();
 
    }
 
    void PrintInfo(std::ostream& rOStream) const override
    {
        rOStream << "DiscreteRandomVariable";
    }
 
 
    void PrintData(std::ostream& rOStream) const override
    {
 
    }
 
protected:
    void Check() override;
 
 
private:
 
    void Normalize();
 
    DiscreteRandomVariable & operator=(DiscreteRandomVariable const& rOther);
 
    double mRelativeClosenessTolerance = 0.0;
    std::vector<double> mRelativeFrequencies;
    std::vector<double> mPossibleValues;
    std::mt19937 mRandomNumberGenerator;
    std::discrete_distribution<> mTrapezoidsDiscreteDistribution;
 
}; // Class DiscreteRandomVariable
 
} // namespace Kratos
 
#endif // DISCRETE_RANDOM_VARIABLE_H defined