JROOT::m_count Struct Reference

Data point for counting measurement. More...

#include <JRootfit.hh>

Public Member Functions
	m_count ()
	Default constructor.
	m_count (const size_t count)
	Constructor.
double	getRho (const double z) const
	Get chi2.
double	getPsi (const double z) const
	Get derivative of chi2.

Static Public Member Functions
static double	epsilon ()
	Minimal value for numerical computations.

Public Attributes
size_t	count
	count

Detailed Description

Data point for counting measurement.

Definition at line 126 of file JRootfit.hh.

Constructor & Destructor Documentation

m_count() [1/2]

JROOT::m_count::m_count ( )

inline

Default constructor.

Definition at line 130 of file JRootfit.hh.

              :
      count(0)
    {}

m_count() [2/2]

JROOT::m_count::m_count ( const size_t count )

inline

Constructor.

Parameters

count

count

Definition at line 140 of file JRootfit.hh.

                                :
      count(count)
    {}

Member Function Documentation

epsilon()

static double JROOT::m_count::epsilon ( )

inlinestatic

Minimal value for numerical computations.

Returns

epsilon

Definition at line 150 of file JRootfit.hh.

    {
      return std::numeric_limits<double>::min();
    }

getRho()

double JROOT::m_count::getRho ( const double z ) const

inline

Get chi2.

Parameters

z	expectation value

Returns

chi2

Definition at line 162 of file JRootfit.hh.

    {
      const double P = poisson(count, z > epsilon() ? z : epsilon());
 
      return -log(P > epsilon() ? P : epsilon());
    }

getPsi()

double JROOT::m_count::getPsi ( const double z ) const

inline

Get derivative of chi2.

Parameters

z	expectation value

Returns

derivative of chi2

Definition at line 176 of file JRootfit.hh.

    {
      return 1.0 - count/(z > epsilon() ? z : epsilon());
    }

Member Data Documentation

count

size_t JROOT::m_count::count

count

Definition at line 182 of file JRootfit.hh.

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

• JRootfit.hh