LocalTrackFit Struct Reference

Local (linear) track description (or a fit result). Uses global reference system. More...

#include <LocalTrackFit.h>

Public Member Functions
double	ChiSqPerNdf () const
void	Eval (double z, double &x, double &y)
	LocalTrackFit (double _z0=0., double _ax=0., double _ay=0., double _bx=0., double _by=0., unsigned int _ndf=0, double _chi_sq=0.)
double	PValue () const

Public Attributes
double	ax
	slopes in rad More...
double	ay
double	bx
	intercepts in mm More...
double	by
double	chi_sq
	the residual sum of squares More...
signed int	ndf
	the number of degrees of freedom More...
double	z0
	the point where intercepts are measured, in mm More...

Detailed Description

Local (linear) track description (or a fit result). Uses global reference system.

Definition at line 18 of file LocalTrackFit.h.

Constructor & Destructor Documentation

LocalTrackFit::LocalTrackFit ( double  _z0 = 0., double  _ax = 0., double  _ay = 0., double  _bx = 0., double  _by = 0., unsigned int  _ndf = 0, double  _chi_sq = 0.  )

inline

Definition at line 35 of file LocalTrackFit.h.

                                                                                                                                   : 
    z0(_z0), ax(_ax), ay(_ay), bx(_bx), by(_by), ndf(_ndf), chi_sq(_chi_sq) {}

Member Function Documentation

double LocalTrackFit::ChiSqPerNdf ( ) const

inline

Definition at line 41 of file LocalTrackFit.h.

References chi_sq, and ndf.

    { return (ndf > 0) ? chi_sq / ndf : 0.; }

void LocalTrackFit::Eval ( double  z, double &  x, double &  y  )

inline

Definition at line 44 of file LocalTrackFit.h.

References ax, ay, bx, by, and z0.

    {
      double ze = z - z0;
      x = ax*ze + bx;
      y = ay*ze + by;
    }

double LocalTrackFit::PValue ( ) const

inline

Definition at line 38 of file LocalTrackFit.h.

References chi_sq, and ndf.

    { return TMath::Prob(chi_sq, ndf); }

Member Data Documentation

double LocalTrackFit::ax

slopes in rad

Definition at line 24 of file LocalTrackFit.h.

Referenced by svgfig.Ellipse::__repr__(), Eval(), and svgfig.Ellipse::Path().

double LocalTrackFit::ay

Definition at line 24 of file LocalTrackFit.h.

Referenced by svgfig.Ellipse::__repr__(), Eval(), and svgfig.Ellipse::Path().

double LocalTrackFit::bx

intercepts in mm

Definition at line 27 of file LocalTrackFit.h.

Referenced by Eval().

double LocalTrackFit::by

Definition at line 27 of file LocalTrackFit.h.

Referenced by Eval().

double LocalTrackFit::chi_sq

the residual sum of squares

Definition at line 33 of file LocalTrackFit.h.

Referenced by ChiSqPerNdf(), and PValue().

signed int LocalTrackFit::ndf

the number of degrees of freedom

Definition at line 30 of file LocalTrackFit.h.

Referenced by ChiSqPerNdf(), and PValue().

double LocalTrackFit::z0

the point where intercepts are measured, in mm

Definition at line 21 of file LocalTrackFit.h.

Referenced by Eval().