SourceXtractorPlusPlus  0.10
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ModelFitting::LogChiSquareComparator Class Reference

Data vs model comparator which computes a modified $\chi^2$ residual. More...

#include <LogChiSquareComparator.h>

Public Member Functions

 LogChiSquareComparator (double u0=10.)
 Creates a new LogChiSquareComparator instance with the given $u_0$. More...
 
double operator() (double real, double model, double weight) const
 Returns the modified $\chi^2$ residual. More...
 

Private Attributes

double m_u0
 

Detailed Description

Data vs model comparator which computes a modified $\chi^2$ residual.

The $\chi^2$ residual is modified to be more immune against occasionally large non-Gaussian deviations. It is computed as:

\[ g_{(u)} = \begin{cases} & u_0 * log\left( 1 + \dfrac{u}{u_0} \right) \text{ if } u \geqslant 0 \\ & -u_0 * log\left( 1 - \dfrac{u}{u_0} \right) \text{ if } u < 0 \end{cases} \]

where:

Definition at line 52 of file LogChiSquareComparator.h.

Constructor & Destructor Documentation

◆ LogChiSquareComparator()

ModelFitting::LogChiSquareComparator::LogChiSquareComparator ( double  u0 = 10.)
inline

Creates a new LogChiSquareComparator instance with the given $u_0$.

Definition at line 57 of file LogChiSquareComparator.h.

Member Function Documentation

◆ operator()()

double ModelFitting::LogChiSquareComparator::operator() ( double  real,
double  model,
double  weight 
) const
inline

Returns the modified $\chi^2$ residual.

Definition at line 60 of file LogChiSquareComparator.h.

References std::log(), and m_u0.

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Member Data Documentation

◆ m_u0

double ModelFitting::LogChiSquareComparator::m_u0
private

Definition at line 67 of file LogChiSquareComparator.h.

Referenced by operator()().


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