FunctionAbsolute-value analogue of the chi-square merit function.
Syntax C/C++#include <VFstd.h>
float VF_chiabs( fVector X, fVector Y, fVector Wt, ui size );
C++ VecObj#include <OptiVec.h>
T vector<T>::chiabs( const vector<T>& Y, const vector<T>& Wt );
Pascal/Delphiuses VFstd;
function VF_chiabs( X, Y, Wt:fVector; size:UIntSize ): Single;
CUDA function C/C++#include <cudaVFstd.h>
int cudaVF_chiabs( float *h_RetVal, fVector d_X, fVector d_Y, fVector d_Wt, ui size );
int cusdVF_chiabs( float *d_RetVal, fVector d_X, fVector d_Y, fVector d_Wt, ui size );
float VFcu_chiabs( fVector h_X, fVector h_Y, fVector h_Wt, ui size );
CUDA function Pascal/Delphiuses VFstd;
function cudaVF_chiabs( var h_RetVal:Single; d_X, d_Y, d_Wt:fVector; size:UIntSize ): IntBool;
function cusdVF_chiabs( d_RetVal:PSingle; d_X, d_Y, d_Wt:fVector; size:UIntSize ): IntBool;
function VFcu_chiabs( h_X, h_Y, h_Wt:fVector; size:UIntSize ): Single;
Descriptionchiabs = sum( Wti * |Xi - Yi| ).
The chiabs function is a "robust" replacement for the c2 (chi-square) merit function. It is used to judge the quality of a fit in the presence of outlier points. The chiabs function is disturbed by outlier points to a lesser degree than the chi-square function.
Error handlingnone
Return valuechiabs merit function.
See alsoVF_chi2

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