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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Sim/Residual/ChiSquaredModule.cpp
//! @brief Implements class ChiSquaredModule.
//!
//! @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/ChiSquaredModule.h"
#include "Base/Util/Assert.h"
#include "Sim/Residual/IIntensityFunction.h"
#include "Sim/Residual/VarianceFunctions.h"
#include <cmath>
#include <limits>
double ChiSquaredModule::residual(double a, double b)
{
double value_simu = a;
double value_real = b;
if (m_intensity_function) {
value_simu = m_intensity_function->evaluate(value_simu);
value_real = m_intensity_function->evaluate(value_real);
}
double variance = m_variance_function->variance(value_real, value_simu);
double normalize = variance <= 0 ? std::numeric_limits<double>::min() : std::sqrt(variance);
return /*std::sqrt(weight) * */ (value_simu - value_real) / normalize;
}
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