org.lcsim.fit.zsegment

Class ZSegmentFit

java.lang.Object

org.lcsim.fit.zsegment.ZSegmentFit

public class ZSegmentFit
extends Object

Encapsulates the constraints in the z0 - tan(lambda) track parameters due to a track passing through a set of detectors segmented in z.

Version:

1.0

Author:

Richard Partridge

Field Summary

Fields

Modifier and Type	Field and Description
private double[]	_centroid
private SymmetricMatrix	_covariance
private List<double[]>	_polygon

Constructor Summary

Constructors

Constructor and Description
ZSegmentFit(List<double[]> polygon, double[] centroid, SymmetricMatrix covariance) Create a new instance of ZSegmentFit

Method Summary

Methods

Modifier and Type	Method and Description
double[]	getCentroid() Return the centroid (i.e., center of gravity) of the allowed region in the z0-tan(lambda) plane
SymmetricMatrix	getCovariance() Return the covariance matrix for the allowed region in the z0 - tan(lambda) plane
List<double[]>	getPolygon() Return the polygon that specifies the allowed region in z0 - tan(lambda) space
String	toString() Return a string containing properties of this ZSegmentFit

Methods inherited from class java.lang.Object

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

Field Detail

_polygon

private List<double[]> _polygon

_centroid

private double[] _centroid

_covariance

private SymmetricMatrix _covariance

Constructor Detail

ZSegmentFit

public ZSegmentFit(List<double[]> polygon,
           double[] centroid,
           SymmetricMatrix covariance)

Create a new instance of ZSegmentFit

Parameters:

polygon - List of vertices of the polygon describing the allowed region in the z0 - tan(lambda) plane. Each vertex is a double[2] with the first element being the z0 coordinate and the second the tan(lambda) coordinate.

centroid - Centroid of the polygon, where centroid[0] is the z0 coordinate, centroid[1] is the tan(lambda) coordinate

covariance - Covariance matrix calculated assuming equal probability for all points in the polygonal allowed region

Method Detail

getPolygon

public List<double[]> getPolygon()

Return the polygon that specifies the allowed region in z0 - tan(lambda) space

Returns:

List of vertices for the polygon. Each vertex is returned as a double[2] with the first element giving the z0 coordinate and the second element the tan(lambda) coordinate

getCentroid

public double[] getCentroid()

Return the centroid (i.e., center of gravity) of the allowed region in the z0-tan(lambda) plane

Returns:

Centroid of the polygon, with the first element giving the z0 coordinate and the second element giving the tan(lambda) coordinate

getCovariance

public SymmetricMatrix getCovariance()

Return the covariance matrix for the allowed region in the z0 - tan(lambda) plane

Returns:

Covariance matrix

toString

public String toString()

Return a string containing properties of this ZSegmentFit

Overrides:

toString in class Object

Returns:

String containing ZSegmentFit properties