Class HelicalTrackFitter

java.lang.Object

org.jlab.rec.cvt.fit.HelicalTrackFitter

public class HelicalTrackFitter
extends Object

A fitter which does sequential fit (for r, phi coordinates) to a circle using CircleFitter and then (for r, z coordinates) to a line using LineFitter. Uses CircleCalculator for corroboration of the results obtained from CircleCalculator

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	HelicalTrackFitter.FitStatus	Status of the HelicalTrackFit

Constructor Summary

Constructors

Constructor	Description
HelicalTrackFitter()	Creates a new instance of HelicalTrackFitter.

Method Summary

Modifier and Type	Method	Description
HelicalTrackFitter.FitStatus	fit(List<Double> X, List<Double> Y, List<Double> Z, List<Double> Rho, List<Double> errRt, List<Double> errRho, List<Double> ErrZ, double xb, double yb)
double[]	getchisq()
CircleCalcPars	getcirclecalcpars()
CircleFitPars	getCircleFit()	Return the circle fit for the most recent helix fit.
HelicalTrackFitPars	getFit()	Return the results of the most recent helix fit.
Helix	gethelix()
LineFitPars	getLineFit()	Return the s-z line fit for the most recent helix fit.
void	setcirclecalcpars(CircleCalcPars _circlecalcpars)
void	setcovmat(double[] chisq)
void	sethelix(Helix helix)
void	setReferencePoint(double x, double y)

Methods inherited from class Object

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

Constructor Details

HelicalTrackFitter

public HelicalTrackFitter()

Creates a new instance of HelicalTrackFitter.

Method Details

fit

public HelicalTrackFitter.FitStatus fit(List<Double> X,
 List<Double> Y,
 List<Double> Z,
 List<Double> Rho,
 List<Double> errRt,
 List<Double> errRho,
 List<Double> ErrZ,
 double xb,
 double yb)

getFit

public HelicalTrackFitPars getFit()

Return the results of the most recent helix fit. Returns null if the fit was not successful.

Returns:

HelicalTrackFitPars from the most recent helix fit

getCircleFit

public CircleFitPars getCircleFit()

Return the circle fit for the most recent helix fit. Returns null if the circle fit was not successful.

Returns:

circle fit from most recent helix fit

getcirclecalcpars

public CircleCalcPars getcirclecalcpars()

setcirclecalcpars

public void setcirclecalcpars(CircleCalcPars _circlecalcpars)

getLineFit

public LineFitPars getLineFit()

Return the s-z line fit for the most recent helix fit. If the line fit failed or was not performed due to not having enough 3D hits, null is returned.

Returns:

line fit for most recent helix fit

setReferencePoint

public void setReferencePoint(double x,
 double y)

gethelix

public Helix gethelix()

sethelix

public void sethelix(Helix helix)

getchisq

public double[] getchisq()

setcovmat

public void setcovmat(double[] chisq)