Description

Definition at line 81 of file IDistribution1DSampler.h.

Inheritance diagram for Distribution1DCosineSampler:

Collaboration diagram for Distribution1DCosineSampler:

Public Member Functions
	Distribution1DCosineSampler (double omega)

double	randomSample () const override

Private Attributes
double	m_omega

Constructor & Destructor Documentation

◆ Distribution1DCosineSampler()

Distribution1DCosineSampler::Distribution1DCosineSampler ( double omega )

inline

Definition at line 83 of file IDistribution1DSampler.h.

         : m_omega(omega)
     {
     }

Member Function Documentation

◆ randomSample()

double Distribution1DCosineSampler::randomSample ( ) const

overridevirtual

Implements IDistribution1DSampler.

Definition at line 69 of file IDistribution1DSampler.cpp.

 {
     std::random_device rd;
     std::mt19937 gen(rd());
  
     // generate a cdf value between 0 and 1
     std::uniform_real_distribution<> uniformDist(0.0, 1.0);
     double cdf_value = uniformDist(gen);
  
     // solve for x from the cdf of Cosine Distribution using Newton-Raphson method
     double func = 0.0, funcDeriv = 0.0, x = 0.0;
  
     // initial guess for x
     if (cdf_value <= 0.5)
         x = -m_omega / 2;
     else
         x = m_omega / 2;
  
     bool convergedSoln = false;
     while (!convergedSoln) {
         func = x + m_omega / M_PI * std::sin(M_PI * x / m_omega) + m_omega * (1 - 2 * cdf_value);
         funcDeriv = 1 + std::cos(M_PI * x / m_omega);
  
         x = x - func / funcDeriv;
  
         if (std::abs(func / funcDeriv) < 0.001)
             convergedSoln = true;
     }
  
     return x;
 }

References m_omega, and M_PI.

Member Data Documentation

◆ m_omega

double Distribution1DCosineSampler::m_omega

private

Definition at line 90 of file IDistribution1DSampler.h.

Referenced by randomSample().

The documentation for this class was generated from the following files:

/home/build/builds/o5h8MZZm/0/mlz/bornagain/Sample/Correlations/IDistribution1DSampler.h
/home/build/builds/o5h8MZZm/0/mlz/bornagain/Sample/Correlations/IDistribution1DSampler.cpp