VarianceFunctions.cpp

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//  ************************************************************************************************
//
//  BornAgain: simulate and fit reflection and scattering
//
//! @file      Sim/Residual/VarianceFunctions.cpp
//! @brief     Implements IVarianceFunction classes
//!
//! @homepage  http://www.bornagainproject.org
//! @license   GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors   Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
//  ************************************************************************************************
 
#include "Sim/Residual/VarianceFunctions.h"
#include <algorithm>
 
//  ************************************************************************************************
//  class VarianceConstantFunction
//  ************************************************************************************************
 
VarianceConstantFunction* VarianceConstantFunction::clone() const
{
    return new VarianceConstantFunction();
}
 
double VarianceConstantFunction::variance(double, double) const
{
    return 1.0;
}
 
//  ************************************************************************************************
//  class VarianceSimFunction
//  ************************************************************************************************
 
VarianceSimFunction::VarianceSimFunction(double epsilon)
    : m_epsilon(epsilon)
{
}
 
VarianceSimFunction* VarianceSimFunction::clone() const
{
    return new VarianceSimFunction(m_epsilon);
}
 
double VarianceSimFunction::variance(double /*exp*/, double sim) const
{
    return std::max(sim, m_epsilon);
}