org.lcsim.recon.tracking.trfbase

Class ETrack

java.lang.Object

org.lcsim.recon.tracking.trfbase.VTrack

org.lcsim.recon.tracking.trfbase.ETrack

public class ETrack
extends VTrack

A track vector with error. Data includes a surface pointer _srf, 5-vector _vec and 5 x 5 symmetric error matrix _err. All are managed internally.

Version:

1.0

Author:

Norman A. Graf

Field Summary

Fields

Modifier and Type	Field and Description
private TrackError	_err

Fields inherited from class org.lcsim.recon.tracking.trfbase.VTrack

_dir, _forward, _srf, _vec

Constructor Summary

Constructors

Constructor and Description
ETrack() default constructor
ETrack(ETrack tre) copy constructor
ETrack(Surface srf) constructor from a surface
ETrack(Surface srf, TrackVector vec, TrackError err) constructor from a surface, track and error matrix
ETrack(Surface srf, TrackVector vec, TrackError err, TrackSurfaceDirection dir) constructor from a surface, track, error matrix and direction
ETrack(VTrack trv, TrackError err) Constructor from a VTrack and an error matrix.

Method Summary

Methods

Modifier and Type	Method and Description
int	checkError() Return the number of bad entries in the error matrix.
static double	chisqDiff(ETrack trv1, ETrack trv2) Return the difference between two track vectors with errors // weighted by their combined error matrix.
static double	chisqDiff(ETrack trv1, VTrack trv2) Get the difference between track vectors with and without errors weighted by the error matrix.
static double	chisqDiff(VTrack trv1, ETrack trv2) Get the difference between track vectors with and without errors weighted by the error matrix.
boolean	equals(ETrack tre) equality
TrackError	error() get error matrix
double	error(int i, int j) get a component of the error matrix
boolean	notEquals(ETrack tre) Inequality
void	setError(TrackError newerr) set the error matrix for the track
String	toString() String representation of ETrack

Methods inherited from class org.lcsim.recon.tracking.trfbase.VTrack

equals, isBackward, isForward, isTrackBackward, isTrackForward, isValid, notEquals, qOverP, setBackward, setForward, setSurface, setTrackBackward, setTrackForward, setVector, setVectorAndKeepDirection, spacePath, spacePoint, surface, vector, vector

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

_err

private TrackError _err

Constructor Detail

ETrack

public ETrack()

default constructor

ETrack

public ETrack(Surface srf)

constructor from a surface

Parameters:

srf - Surface srf at which track is to be defined

ETrack

public ETrack(Surface srf,
      TrackVector vec,
      TrackError err)

constructor from a surface, track and error matrix

Parameters:

srf - Surface srf at which track is to be defined

vec - TrackVector vec containing track parameters

err - TrackError err containing track parameter errors

ETrack

public ETrack(Surface srf,
      TrackVector vec,
      TrackError err,
      TrackSurfaceDirection dir)

constructor from a surface, track, error matrix and direction

Parameters:

srf - Surface srf at which track is to be defined

vec - TrackVector vec containing track parameters

err - TrackError err containing track parameter errors

dir - TrackSurfaceDirection dir direction of track relative to the Surface

ETrack

public ETrack(VTrack trv,
      TrackError err)

Constructor from a VTrack and an error matrix.

Parameters:

trv - VTrack trv representing track without errors

err - TrackError err containing track parameter errors

ETrack

public ETrack(ETrack tre)

copy constructor

Parameters:

tre - ETrack tre to be copied

Method Detail

setError

public void setError(TrackError newerr)

set the error matrix for the track

Parameters:

newerr - TrackError newerr containg error matrix

toString

public String toString()

String representation of ETrack

Overrides:

toString in class VTrack

Returns:

String representation of ETrack

error

public TrackError error()

get error matrix

Returns:

TrackError error matrix for track parameters

error

public double error(int i,
           int j)

get a component of the error matrix

Parameters:

i - first index

j - second index

Returns:

value of error matrix element (i,j)

checkError

public int checkError()

Return the number of bad entries in the error matrix.

Returns:

the number of bad entries in the error matrix

equals

public boolean equals(ETrack tre)

equality

Parameters:

tre - ETrack to compare

Returns:

true if this equals tre

notEquals

public boolean notEquals(ETrack tre)

Inequality

Parameters:

tre - ETrack to compare

Returns:

true if this does not equal tre

chisqDiff

public static double chisqDiff(ETrack trv1,
               ETrack trv2)

Return the difference between two track vectors with errors // weighted by their combined error matrix.

Parameters:

trv1 - first ETrack

trv2 - second ETrack

Returns:

chisquare difference of trv1 and trv2

chisqDiff

public static double chisqDiff(ETrack trv1,
               VTrack trv2)

Get the difference between track vectors with and without errors weighted by the error matrix.

Parameters:

trv1 - first ETrack

trv2 - second ETrack

Returns:

chisquare difference of trv1 and trv2

chisqDiff

public static double chisqDiff(VTrack trv1,
               ETrack trv2)

Get the difference between track vectors with and without errors weighted by the error matrix.

Parameters:

trv1 - first VTrack

trv2 - second VTrack

Returns:

chisquare difference of trv1 and trv2