org.lcsim.fit.helicaltrack

Class TrackDirection

java.lang.Object

org.lcsim.fit.helicaltrack.TrackDirection

public class TrackDirection
extends Object

Encapsulate the track direction and direction derivatives.

Author:

Richard Partridge

Field Summary

Fields

Modifier and Type	Field and Description
private Matrix	_deriv
private Hep3Vector	_dir

Constructor Summary

Constructors

Constructor and Description
TrackDirection(Hep3Vector dir, Matrix deriv) Creates a new instance of TrackDirection.

Method Summary

Methods

Modifier and Type	Method and Description
Matrix	Derivatives() Return the direction derivatives.
Hep3Vector	Direction() Return the track direction.

Methods inherited from class java.lang.Object

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

Field Detail

_dir

private Hep3Vector _dir

_deriv

private Matrix _deriv

Constructor Detail

TrackDirection

public TrackDirection(Hep3Vector dir,
              Matrix deriv)

Creates a new instance of TrackDirection.

Parameters:

dir - track direction

deriv - derivative of the track direction wrt helix parameters

Method Detail

Direction

public Hep3Vector Direction()

Return the track direction.

Returns:

track direction

Derivatives

public Matrix Derivatives()

Return the direction derivatives. In the direction derivative matrix, the row identifies the cartesian direction coordinate and the column identifies the helix parameter.

Returns:

direction derivatives