MuonCalib::BaseFunctionFitter Class Reference

#include <BaseFunctionFitter.h>

Collaboration diagram for MuonCalib::BaseFunctionFitter:

Public Member Functions
	BaseFunctionFitter (void)
	default constructor, the number of fit parameters will be set to 5 More...
	BaseFunctionFitter (const int &nb_coefficients)
	constructor, the number of fit parameters is set to nb_coefficients More...
int	number_of_coefficients (void) const
	get the number of fit parameters (coefficients) of the base functions to be fitted More...
Amg::VectorX	coefficients (void) const
	get the coefficients determined by the fit to the sample points More...
void	set_number_of_coefficients (const int &nb_coefficients)
	set the number of fit parameters (coefficients) of the base functions to nb_coefficients More...
bool	fit_parameters (const std::vector< SamplePoint > &sample_point, const unsigned int &first_point, const unsigned int &last_point, BaseFunction *base_function)
	perform a fit of the base functions (base_function) to the sample points as given in "sample_point" starting at the sample point first_point and stopping at the point last_point, 1 <= first_point < last_point <= size of the sample_point vector; the method returns true, if the fit failed More...

Private Member Functions
void	init (void)
	default initialization method More...
void	init (const int &nb_coefficients)
	initialization method: the number of fit parameters (coefficients) is set to nb_coefficients More...

Private Attributes
int	m_nb_coefficients
	number of coefficients More...
Amg::MatrixX	m_A
	coefficient matrix for the fit More...
Amg::VectorX	m_alpha
	coefficients of the base functions after the fit More...
Amg::VectorX	m_b
	m_A*m_alpha = m_b; More...

Detailed Description

This class performs a fit of a linear combination of base functions to a set of sample points.

Author

Olive.nosp@m.r.Ko.nosp@m.rtner.nosp@m.@cer.nosp@m.n.ch

Date

05.04.2005

Definition at line 47 of file BaseFunctionFitter.h.

Constructor & Destructor Documentation

BaseFunctionFitter() [1/2]

MuonCalib::BaseFunctionFitter::BaseFunctionFitter ( void  )

inline

default constructor, the number of fit parameters will be set to 5

Definition at line 65 of file BaseFunctionFitter.h.

                             {
      init();
    } 

BaseFunctionFitter() [2/2]

MuonCalib::BaseFunctionFitter::BaseFunctionFitter ( const int &  nb_coefficients )

inline

constructor, the number of fit parameters is set to nb_coefficients

Definition at line 69 of file BaseFunctionFitter.h.

                                                    {
      init(nb_coefficients);
    }               

Member Function Documentation

coefficients()

Amg::VectorX MuonCalib::BaseFunctionFitter::coefficients ( void  ) const

inline

get the coefficients determined by the fit to the sample points

fit_parameters()

bool MuonCalib::BaseFunctionFitter::fit_parameters	(	const std::vector< SamplePoint > &	sample_point,
		const unsigned int &	first_point,
		const unsigned int &	last_point,
		BaseFunction *	base_function
	)

perform a fit of the base functions (base_function) to the sample points as given in "sample_point" starting at the sample point first_point and stopping at the point last_point, 1 <= first_point < last_point <= size of the sample_point vector; the method returns true, if the fit failed

Definition at line 18 of file BaseFunctionFitter.cxx.

                                                     {
 
// CHECKS //
 
    if (first_point<1 || first_point>sample_point.size()) {
        throw std::runtime_error(Form("File: %s, Line: %d\nBaseFunctionFitter::fit_parameters() - ERROR: Illegal first point %d, must be >=1 and <=%lu", __FILE__, __LINE__, first_point, sample_point.size()));
    }
    if (last_point<first_point || last_point>sample_point.size()) {
        throw std::runtime_error(Form("File: %s, Line: %d\nBaseFunctionFitter::fit_parameters() - ERROR: Illegal last point %d, must be >=%d and <=%lu", __FILE__, __LINE__, last_point, first_point, sample_point.size()));
    }
 
// IF ALL CHECK ARE PASSED, FILL THE MINIMIZATION OBJECTS //
 
// clear the objects //
    init(m_nb_coefficients);
 
    for (int j=0; j<m_nb_coefficients; j++) {
        for (int p=j; p<m_nb_coefficients; p++) {
 
          for (unsigned int k=first_point-1; k<last_point; k++) {
            m_A.fillSymmetric(j,p,m_A(j,p)+base_function->value(j,sample_point[k].x1())
                      *base_function->value(p,sample_point[k].x1())/
                      std::pow(sample_point[k].error(), 2));
 
          }
 
        }
 
        for (unsigned int k=first_point-1; k<last_point; k++) {
            m_b[j] = m_b[j]+sample_point[k].x2()*
                    base_function->value(j, 
                    sample_point[k].x1())/
                    std::pow(sample_point[k].error(), 2);
        }
 
    }
 
// perform the minimization //
    Amg::MatrixX aInv = m_A.inverse();
    m_alpha = aInv*m_b;
 
    return false;
 
}

init() [1/2]

void MuonCalib::BaseFunctionFitter::init ( const int &  nb_coefficients )

inlineprivate

initialization method: the number of fit parameters (coefficients) is set to nb_coefficients

init() [2/2]

void MuonCalib::BaseFunctionFitter::init ( void  )

inlineprivate

default initialization method

number_of_coefficients()

int MuonCalib::BaseFunctionFitter::number_of_coefficients ( void  ) const

inline

get the number of fit parameters (coefficients) of the base functions to be fitted

set_number_of_coefficients()

void MuonCalib::BaseFunctionFitter::set_number_of_coefficients ( const int &  nb_coefficients )

inline

set the number of fit parameters (coefficients) of the base functions to nb_coefficients

Member Data Documentation

m_A

Amg::MatrixX MuonCalib::BaseFunctionFitter::m_A

private

coefficient matrix for the fit

Definition at line 52 of file BaseFunctionFitter.h.

m_alpha

Amg::VectorX MuonCalib::BaseFunctionFitter::m_alpha

private

coefficients of the base functions after the fit

Definition at line 53 of file BaseFunctionFitter.h.

m_b

Amg::VectorX MuonCalib::BaseFunctionFitter::m_b

private

m_A*m_alpha = m_b;

Definition at line 54 of file BaseFunctionFitter.h.

m_nb_coefficients

int MuonCalib::BaseFunctionFitter::m_nb_coefficients

private

number of coefficients

Definition at line 51 of file BaseFunctionFitter.h.

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

• BaseFunctionFitter.h
• BaseFunctionFitter.cxx