[u/mrichter/AliRoot.git] / MFT / AliMuonForwardTrack.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

//====================================================================================================================================================
//
//      Description of an ALICE muon forward track, combining the information of the Muon Spectrometer and the Muon Forward Tracker
//
//      Contact author: antonio.uras@cern.ch
//
//====================================================================================================================================================

#include "AliLog.h"
#include "AliMUONTrack.h"
#include "AliMFTCluster.h"
#include "AliMUONVCluster.h"
#include "AliMUONTrackParam.h"
#include "AliMUONTrackExtrap.h"
#include "TClonesArray.h"
#include "TMatrixD.h"
#include "TParticle.h"
#include "AliMuonForwardTrack.h"
#include "AliMFTConstants.h"

ClassImp(AliMuonForwardTrack)

//====================================================================================================================================================

AliMuonForwardTrack::AliMuonForwardTrack():
  AliMUONTrack(),
  fMUONTrack(0),
  fMCTrackRef(0),
  fMFTClusters(0),
  fNWrongClustersMC(-1),
  fTrackMCId(-1)
{

  // default constructor
  
  for (Int_t iPlane=0; iPlane<AliMFTConstants::fNMaxPlanes; iPlane++) fPlaneExists[iPlane] = kFALSE;
  for (Int_t iParent=0; iParent<fgkNParentsMax; iParent++) {
    fParentMCLabel[iParent] = -1;
    fParentPDGCode[iParent] =  0;
  }
  fMFTClusters = new TClonesArray("AliMFTCluster");

}

//====================================================================================================================================================

AliMuonForwardTrack::AliMuonForwardTrack(AliMUONTrack *MUONTrack):
  AliMUONTrack(),
  fMUONTrack(0),
  fMCTrackRef(0),
  fMFTClusters(0),
  fNWrongClustersMC(-1),
  fTrackMCId(-1)
{

  SetMUONTrack(MUONTrack);
  for (Int_t iPlane=0; iPlane<AliMFTConstants::fNMaxPlanes; iPlane++) fPlaneExists[iPlane] = kFALSE;
  for (Int_t iParent=0; iParent<fgkNParentsMax; iParent++) {
    fParentMCLabel[iParent] = -1;
    fParentPDGCode[iParent] =  0;
  }
  fMFTClusters = new TClonesArray("AliMFTCluster");

}

//====================================================================================================================================================

AliMuonForwardTrack::AliMuonForwardTrack(const AliMuonForwardTrack& track): 
  AliMUONTrack(track),
  fMUONTrack(0x0),
  fMCTrackRef(0x0),
  fMFTClusters(0x0),
  fNWrongClustersMC(track.fNWrongClustersMC),
  fTrackMCId(track.fTrackMCId)
{

  // copy constructor
  fMUONTrack        = new AliMUONTrack(*(track.fMUONTrack));
  if (track.fMCTrackRef) fMCTrackRef = new TParticle(*(track.fMCTrackRef));
  fMFTClusters      = new TClonesArray(*(track.fMFTClusters));
  for (Int_t iPlane=0; iPlane<AliMFTConstants::fNMaxPlanes; iPlane++) fPlaneExists[iPlane] = (track.fPlaneExists)[iPlane];
  for (Int_t iParent=0; iParent<fgkNParentsMax; iParent++) {
    fParentMCLabel[iParent] = (track.fParentMCLabel)[iParent];
    fParentPDGCode[iParent] = (track.fParentPDGCode)[iParent];
  }
  
}

//====================================================================================================================================================

AliMuonForwardTrack& AliMuonForwardTrack::operator=(const AliMuonForwardTrack& track) {

  // Asignment operator

  // check assignement to self
  if (this == &track) return *this;

  // base class assignement
  AliMUONTrack::operator=(track);
  
  // clear memory
  Clear();
  
  fMUONTrack        = new AliMUONTrack(*(track.fMUONTrack));
  if (track.fMCTrackRef) fMCTrackRef = new TParticle(*(track.fMCTrackRef));
  fMFTClusters      = new TClonesArray(*(track.fMFTClusters));
  fNWrongClustersMC = track.fNWrongClustersMC;
  fTrackMCId        = track.fTrackMCId;

  for (Int_t iPlane=0; iPlane<AliMFTConstants::fNMaxPlanes; iPlane++) fPlaneExists[iPlane] = (track.fPlaneExists)[iPlane];
  for (Int_t iParent=0; iParent<fgkNParentsMax; iParent++) {
    fParentMCLabel[iParent] = (track.fParentMCLabel)[iParent];
    fParentPDGCode[iParent] = (track.fParentPDGCode)[iParent];
  }
  
  return *this;

}

//====================================================================================================================================================

void AliMuonForwardTrack::SetMUONTrack(AliMUONTrack *MUONTrack) {

  if (fMUONTrack) {
    AliInfo("fMUONTrack already exists, nothing will be done");
    return;
  }

  fMUONTrack = MUONTrack;
  SetGlobalChi2(fMUONTrack->GetGlobalChi2());
  
}

//====================================================================================================================================================

void AliMuonForwardTrack::SetMCTrackRef(TParticle *MCTrackRef) {

  if (fMCTrackRef) {
    AliInfo("fMCTrackRef already exists, nothing will be done");
    return;
  }

  fMCTrackRef = MCTrackRef;
  
}

//====================================================================================================================================================

void AliMuonForwardTrack::AddTrackParamAtMFTCluster(AliMUONTrackParam &trackParam, AliMFTCluster &mftCluster) {

  AliDebug(1, Form("Before adding: this->fMFTClusters=%p has %d entries", this->fMFTClusters, this->fMFTClusters->GetEntries()));
  Int_t iMFTCluster = this->fMFTClusters->GetEntries();
  AliDebug(1, Form("mftCluster->GetX() = %f  mftCluster->GetY() = %f  mftCluster->GetErrX() = %f  cmftCluster->GetErrY() = %f", 
	   mftCluster.GetX(), mftCluster.GetY(), mftCluster.GetErrX(), mftCluster.GetErrY()));
  AliMUONVCluster *muonCluster = (AliMUONVCluster*) mftCluster.CreateMUONCluster();
  AliDebug(1, Form("Created MUON cluster %p", muonCluster));
  trackParam.SetUniqueID(iMFTCluster);    // we profit of this slot to store the reference to the corresponding MFTCluster
  AliDebug(1, Form("Now adding muonCluster %p and trackParam %p",muonCluster, &trackParam));
  AddTrackParamAtCluster(trackParam, *muonCluster, kTRUE);
  // we pass the parameters this->GetTrackParamAtCluster()->First() to the Kalman Filter algorithm: they will be updated!!
  Double_t chi2Kalman = RunKalmanFilter(*(AliMUONTrackParam*)(GetTrackParamAtCluster()->First()));
  AliDebug(1, Form("Adding Kalman chi2 = %f to global chi2 = %f", chi2Kalman, GetGlobalChi2()));
  Double_t newGlobalChi2 = GetGlobalChi2() + chi2Kalman;
  mftCluster.SetLocalChi2(chi2Kalman);
  mftCluster.SetTrackChi2(newGlobalChi2);
  new ((*(this->fMFTClusters))[iMFTCluster]) AliMFTCluster(mftCluster);
  AliDebug(1, Form("GetTrackParamAtCluster() = %p  has %d entries while this->fMFTClusters=%p has %d entries",
		   GetTrackParamAtCluster(), GetTrackParamAtCluster()->GetEntries(), this->fMFTClusters, this->fMFTClusters->GetEntries()));
  AliDebug(1, Form("muonCluster->GetZ() = %f, trackParam->GetZ() = %f",muonCluster->GetZ(), trackParam.GetZ()));
  SetGlobalChi2(newGlobalChi2);
  AliDebug(1, Form("New global chi2 = %f", GetGlobalChi2()));
  ((AliMUONTrackParam*) GetTrackParamAtCluster()->First())->SetTrackChi2(newGlobalChi2);
  for (Int_t iPar=0; iPar<GetTrackParamAtCluster()->GetEntries(); iPar++) {
    AliDebug(1, Form("GetTrackParamAtCluster()->At(%d)->GetClusterPtr() = %p",
		     iPar, ((AliMUONTrackParam*)(GetTrackParamAtCluster()->At(iPar)))->GetClusterPtr()));
  }

}

//====================================================================================================================================================

AliMUONTrackParam* AliMuonForwardTrack::GetTrackParamAtMUONCluster(Int_t iMUONCluster) {

  if (iMUONCluster<0 || iMUONCluster>=GetNMUONClusters()) {
    AliError("Invalid MUON cluster index. NULL pointer will be returned");
    return NULL;
  }

  AliMUONTrackParam *trackParam = (AliMUONTrackParam*) fMUONTrack->GetTrackParamAtCluster()->At(iMUONCluster); 

  return trackParam;

}

//====================================================================================================================================================

AliMUONTrackParam* AliMuonForwardTrack::GetTrackParamAtMFTCluster(Int_t iMFTCluster) {

  if (iMFTCluster<0 || iMFTCluster>=GetNMFTClusters()) {
    AliError("Invalid MFT cluster index. NULL pointer will be returned");
    return NULL;
  }

  AliMUONTrackParam *trackParam = (AliMUONTrackParam*) GetTrackParamAtCluster()->At(iMFTCluster); 

  return trackParam;

}

//====================================================================================================================================================

AliMUONVCluster* AliMuonForwardTrack::GetMUONCluster(Int_t iMUONCluster) {

  if (iMUONCluster<0 || iMUONCluster>=GetNMUONClusters()) {
    AliError("Invalid MUON cluster index. NULL pointer will be returned");
    return NULL;
  }

  AliMUONTrackParam *trackParam = GetTrackParamAtMUONCluster(iMUONCluster);
  AliMUONVCluster *muonCluster = trackParam->GetClusterPtr();

  return muonCluster;

}

//====================================================================================================================================================

AliMFTCluster* AliMuonForwardTrack::GetMFTCluster(Int_t iMFTCluster) {

  if (iMFTCluster<0 || iMFTCluster>=GetNMFTClusters()) {
    AliError(Form("Invalid MFT cluster index (%d). GetNMFTClusters()=%d. NULL pointer will be returned", iMFTCluster, GetNMFTClusters()));
    return NULL;
  }

  AliMUONTrackParam *trackParam = GetTrackParamAtMFTCluster(iMFTCluster);
  AliMFTCluster *mftCluster = (AliMFTCluster*) this->fMFTClusters->At(trackParam->GetUniqueID());

  return mftCluster;

}

//====================================================================================================================================================

Double_t AliMuonForwardTrack::RunKalmanFilter(AliMUONTrackParam &trackParamAtCluster) {

  AliDebug(1, Form("Running Kalman filter for parameters %p (z = %f) and cluster %p (z = %f)", 
		   &trackParamAtCluster, trackParamAtCluster.GetZ(), trackParamAtCluster.GetClusterPtr(), trackParamAtCluster.GetClusterPtr()->GetZ()));
  
  // Compute new track parameters and their covariances including new cluster using kalman filter
  // return the *additional* track chi2
  
  // Get actual track parameters (p)
  TMatrixD param(trackParamAtCluster.GetParameters());
  
  // Get new cluster parameters (m)
  AliMUONVCluster *cluster = trackParamAtCluster.GetClusterPtr();
  AliDebug(1, Form("cluster->GetX() = %f  cluster->GetY() = %f  cluster->GetErrX() = %f  cluster->GetErrY() = %f", 
		   cluster->GetX(), cluster->GetY(), cluster->GetErrX(), cluster->GetErrY()));
  TMatrixD clusterParam(5,1);
  clusterParam.Zero();
  clusterParam(0,0) = cluster->GetX();
  clusterParam(2,0) = cluster->GetY();

  // Compute the current parameter weight (W)
  TMatrixD paramWeight(trackParamAtCluster.GetCovariances());
  if (paramWeight.Determinant() != 0) {
    paramWeight.Invert();
  } else {
    Warning("RunKalmanFilter"," Determinant = 0");
    return 1.e10;
  }
  
  // Compute the new cluster weight (U)
  TMatrixD clusterWeight(5,5);
  clusterWeight.Zero();
  clusterWeight(0,0) = 1. / cluster->GetErrX2();
  clusterWeight(2,2) = 1. / cluster->GetErrY2();

  // Compute the new parameters covariance matrix ( (W+U)^-1 )
  TMatrixD newParamCov(paramWeight,TMatrixD::kPlus,clusterWeight);
  if (newParamCov.Determinant() != 0) {
    newParamCov.Invert();
  } 
  else {
    Warning("RunKalmanFilter"," Determinant = 0");
    return 1.e10;
  }
  
  // Save the new parameters covariance matrix
  trackParamAtCluster.SetCovariances(newParamCov);
  
  // Compute the new parameters (p' = ((W+U)^-1)U(m-p) + p)
  TMatrixD tmp(clusterParam,TMatrixD::kMinus,param);
  TMatrixD tmp2(clusterWeight,TMatrixD::kMult,tmp);    // U(m-p)
  TMatrixD newParam(newParamCov,TMatrixD::kMult,tmp2); // ((W+U)^-1)U(m-p)
  newParam += param;                                   // ((W+U)^-1)U(m-p) + p

  // Save the new parameters
  trackParamAtCluster.SetParameters(newParam);
  
  // Compute the additional chi2 (= ((p'-p)^-1)W(p'-p) + ((p'-m)^-1)U(p'-m))
  tmp = newParam; // p'
  tmp -= param;   // (p'-p)
  TMatrixD tmp3(paramWeight,TMatrixD::kMult,tmp);           // W(p'-p)
  TMatrixD addChi2Track(tmp,TMatrixD::kTransposeMult,tmp3); // ((p'-p)^-1)W(p'-p)
  tmp = newParam;      // p'
  tmp -= clusterParam; // (p'-m)
  TMatrixD tmp4(clusterWeight,TMatrixD::kMult,tmp);            // U(p'-m)
  addChi2Track += TMatrixD(tmp,TMatrixD::kTransposeMult,tmp4); // ((p'-p)^-1)W(p'-p) + ((p'-m)^-1)U(p'-m)
  
  AliDebug(1,Form("Adding Kalman chi2 = %f",addChi2Track(0,0)));

  return addChi2Track(0,0);
  
}

//====================================================================================================================================================

Double_t AliMuonForwardTrack::GetWeightedOffset(Double_t x, Double_t y, Double_t z) {

  AliMUONTrackParam *param = GetTrackParamAtMFTCluster(0);
  AliMUONTrackExtrap::ExtrapToZCov(param, z);

  TMatrixD cov(5,5);
  cov = param->GetCovariances();

  TMatrixD covCoordinates(2,2);
  covCoordinates(0,0) = cov(0,0);
  covCoordinates(0,1) = cov(0,2);
  covCoordinates(1,0) = cov(2,0);
  covCoordinates(1,1) = cov(2,2);
  
  TMatrixD covCoordinatesInverse = covCoordinates.Invert();

  Double_t dX = param->GetNonBendingCoor() - x;
  Double_t dY = param->GetBendingCoor()    - y;
  
  Double_t weightedOffset = TMath::Sqrt(0.5*(dX*dX*covCoordinatesInverse(0,0) + 
					     dY*dY*covCoordinatesInverse(1,1) + 
					     2.*dX*dY*covCoordinatesInverse(0,1)));

  return weightedOffset;

}

//====================================================================================================================================================

Double_t AliMuonForwardTrack::GetOffsetX(Double_t x, Double_t z) {

  AliMUONTrackParam *param = GetTrackParamAtMFTCluster(0);
  AliMUONTrackExtrap::ExtrapToZCov(param, z);
  Double_t dX = param->GetNonBendingCoor() - x;
  return dX;

}

//====================================================================================================================================================

Double_t AliMuonForwardTrack::GetOffsetY(Double_t y, Double_t z) {

  AliMUONTrackParam *param = GetTrackParamAtMFTCluster(0);
  AliMUONTrackExtrap::ExtrapToZCov(param, z);
  Double_t dY = param->GetBendingCoor() - y;
  return dY;

}

//====================================================================================================================================================

Double_t AliMuonForwardTrack::GetOffset(Double_t x, Double_t y, Double_t z) {

  AliMUONTrackParam *param = GetTrackParamAtMFTCluster(0);
  AliMUONTrackExtrap::ExtrapToZCov(param, z);
  Double_t dX = param->GetNonBendingCoor() - x;
  Double_t dY = param->GetBendingCoor()    - y;
  return TMath::Sqrt(dX*dX + dY*dY);

}

//====================================================================================================================================================
Commit	Line	Data
820b4d9e	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16	//====================================================================================================================================================
	17	//
	18	// Description of an ALICE muon forward track, combining the information of the Muon Spectrometer and the Muon Forward Tracker
	19	//
	20	// Contact author: antonio.uras@cern.ch
	21	//
	22	//====================================================================================================================================================
	23
	24	#include "AliLog.h"
	25	#include "AliMUONTrack.h"
	26	#include "AliMFTCluster.h"
	27	#include "AliMUONVCluster.h"
	28	#include "AliMUONTrackParam.h"
	29	#include "AliMUONTrackExtrap.h"
	30	#include "TClonesArray.h"
	31	#include "TMatrixD.h"
	32	#include "TParticle.h"
	33	#include "AliMuonForwardTrack.h"
d4643a10	34	#include "AliMFTConstants.h"
820b4d9e	35
	36	ClassImp(AliMuonForwardTrack)
	37
	38	//====================================================================================================================================================
	39
	40	AliMuonForwardTrack::AliMuonForwardTrack():
	41	AliMUONTrack(),
	42	fMUONTrack(0),
	43	fMCTrackRef(0),
d4643a10	44	fMFTClusters(0),
7e3dd1af	45	fNWrongClustersMC(-1),
7e3dd1af	46	fTrackMCId(-1)
820b4d9e	47	{
	48
	49	// default constructor
d4643a10	50
	51	for (Int_t iPlane=0; iPlane<AliMFTConstants::fNMaxPlanes; iPlane++) fPlaneExists[iPlane] = kFALSE;
	52	for (Int_t iParent=0; iParent<fgkNParentsMax; iParent++) {
	53	fParentMCLabel[iParent] = -1;
	54	fParentPDGCode[iParent] = 0;
	55	}
820b4d9e	56	fMFTClusters = new TClonesArray("AliMFTCluster");
	57
	58	}
	59
	60	//====================================================================================================================================================
	61
	62	AliMuonForwardTrack::AliMuonForwardTrack(AliMUONTrack *MUONTrack):
	63	AliMUONTrack(),
	64	fMUONTrack(0),
	65	fMCTrackRef(0),
d4643a10	66	fMFTClusters(0),
7e3dd1af	67	fNWrongClustersMC(-1),
7e3dd1af	68	fTrackMCId(-1)
820b4d9e	69	{
	70
	71	SetMUONTrack(MUONTrack);
d4643a10	72	for (Int_t iPlane=0; iPlane<AliMFTConstants::fNMaxPlanes; iPlane++) fPlaneExists[iPlane] = kFALSE;
	73	for (Int_t iParent=0; iParent<fgkNParentsMax; iParent++) {
	74	fParentMCLabel[iParent] = -1;
	75	fParentPDGCode[iParent] = 0;
	76	}
820b4d9e	77	fMFTClusters = new TClonesArray("AliMFTCluster");
	78
	79	}
	80
	81	//====================================================================================================================================================
	82
	83	AliMuonForwardTrack::AliMuonForwardTrack(const AliMuonForwardTrack& track):
	84	AliMUONTrack(track),
d4643a10	85	fMUONTrack(0x0),
	86	fMCTrackRef(0x0),
	87	fMFTClusters(0x0),
7e3dd1af	88	fNWrongClustersMC(track.fNWrongClustersMC),
7e3dd1af	89	fTrackMCId(track.fTrackMCId)
820b4d9e	90	{
	91
	92	// copy constructor
d4643a10	93	fMUONTrack = new AliMUONTrack(*(track.fMUONTrack));
	94	if (track.fMCTrackRef) fMCTrackRef = new TParticle(*(track.fMCTrackRef));
	95	fMFTClusters = new TClonesArray(*(track.fMFTClusters));
	96	for (Int_t iPlane=0; iPlane<AliMFTConstants::fNMaxPlanes; iPlane++) fPlaneExists[iPlane] = (track.fPlaneExists)[iPlane];
	97	for (Int_t iParent=0; iParent<fgkNParentsMax; iParent++) {
	98	fParentMCLabel[iParent] = (track.fParentMCLabel)[iParent];
	99	fParentPDGCode[iParent] = (track.fParentPDGCode)[iParent];
	100	}
820b4d9e	101
	102	}
	103
	104	//====================================================================================================================================================
	105
	106	AliMuonForwardTrack& AliMuonForwardTrack::operator=(const AliMuonForwardTrack& track) {
	107
	108	// Asignment operator
	109
	110	// check assignement to self
	111	if (this == &track) return *this;
	112
	113	// base class assignement
	114	AliMUONTrack::operator=(track);
	115
	116	// clear memory
	117	Clear();
	118
d4643a10	119	fMUONTrack = new AliMUONTrack(*(track.fMUONTrack));
	120	if (track.fMCTrackRef) fMCTrackRef = new TParticle(*(track.fMCTrackRef));
	121	fMFTClusters = new TClonesArray(*(track.fMFTClusters));
	122	fNWrongClustersMC = track.fNWrongClustersMC;
7e3dd1af	123	fTrackMCId = track.fTrackMCId;
d4643a10	124
	125	for (Int_t iPlane=0; iPlane<AliMFTConstants::fNMaxPlanes; iPlane++) fPlaneExists[iPlane] = (track.fPlaneExists)[iPlane];
	126	for (Int_t iParent=0; iParent<fgkNParentsMax; iParent++) {
	127	fParentMCLabel[iParent] = (track.fParentMCLabel)[iParent];
	128	fParentPDGCode[iParent] = (track.fParentPDGCode)[iParent];
	129	}
820b4d9e	130
	131	return *this;
	132
	133	}
	134
	135	//====================================================================================================================================================
	136
	137	void AliMuonForwardTrack::SetMUONTrack(AliMUONTrack *MUONTrack) {
	138
	139	if (fMUONTrack) {
	140	AliInfo("fMUONTrack already exists, nothing will be done");
	141	return;
	142	}
	143
	144	fMUONTrack = MUONTrack;
d4643a10	145	SetGlobalChi2(fMUONTrack->GetGlobalChi2());
820b4d9e	146
	147	}
	148
	149	//====================================================================================================================================================
	150
	151	void AliMuonForwardTrack::SetMCTrackRef(TParticle *MCTrackRef) {
	152
	153	if (fMCTrackRef) {
	154	AliInfo("fMCTrackRef already exists, nothing will be done");
	155	return;
	156	}
	157
	158	fMCTrackRef = MCTrackRef;
	159
	160	}
	161
	162	//====================================================================================================================================================
	163
	164	void AliMuonForwardTrack::AddTrackParamAtMFTCluster(AliMUONTrackParam &trackParam, AliMFTCluster &mftCluster) {
	165
d4643a10	166	AliDebug(1, Form("Before adding: this->fMFTClusters=%p has %d entries", this->fMFTClusters, this->fMFTClusters->GetEntries()));
d4643a10	167	Int_t iMFTCluster = this->fMFTClusters->GetEntries();
820b4d9e	168	AliDebug(1, Form("mftCluster->GetX() = %f mftCluster->GetY() = %f mftCluster->GetErrX() = %f cmftCluster->GetErrY() = %f",
	169	mftCluster.GetX(), mftCluster.GetY(), mftCluster.GetErrX(), mftCluster.GetErrY()));
	170	AliMUONVCluster muonCluster = (AliMUONVCluster) mftCluster.CreateMUONCluster();
	171	AliDebug(1, Form("Created MUON cluster %p", muonCluster));
	172	trackParam.SetUniqueID(iMFTCluster); // we profit of this slot to store the reference to the corresponding MFTCluster
	173	AliDebug(1, Form("Now adding muonCluster %p and trackParam %p",muonCluster, &trackParam));
	174	AddTrackParamAtCluster(trackParam, *muonCluster, kTRUE);
820b4d9e	175	// we pass the parameters this->GetTrackParamAtCluster()->First() to the Kalman Filter algorithm: they will be updated!!
820b4d9e	176	Double_t chi2Kalman = RunKalmanFilter((AliMUONTrackParam)(GetTrackParamAtCluster()->First()));
d4643a10	177	AliDebug(1, Form("Adding Kalman chi2 = %f to global chi2 = %f", chi2Kalman, GetGlobalChi2()));
820b4d9e	178	Double_t newGlobalChi2 = GetGlobalChi2() + chi2Kalman;
	179	mftCluster.SetLocalChi2(chi2Kalman);
	180	mftCluster.SetTrackChi2(newGlobalChi2);
d4643a10	181	new ((*(this->fMFTClusters))[iMFTCluster]) AliMFTCluster(mftCluster);
	182	AliDebug(1, Form("GetTrackParamAtCluster() = %p has %d entries while this->fMFTClusters=%p has %d entries",
	183	GetTrackParamAtCluster(), GetTrackParamAtCluster()->GetEntries(), this->fMFTClusters, this->fMFTClusters->GetEntries()));
820b4d9e	184	AliDebug(1, Form("muonCluster->GetZ() = %f, trackParam->GetZ() = %f",muonCluster->GetZ(), trackParam.GetZ()));
820b4d9e	185	SetGlobalChi2(newGlobalChi2);
d4643a10	186	AliDebug(1, Form("New global chi2 = %f", GetGlobalChi2()));
820b4d9e	187	((AliMUONTrackParam*) GetTrackParamAtCluster()->First())->SetTrackChi2(newGlobalChi2);
	188	for (Int_t iPar=0; iPar<GetTrackParamAtCluster()->GetEntries(); iPar++) {
	189	AliDebug(1, Form("GetTrackParamAtCluster()->At(%d)->GetClusterPtr() = %p",
	190	iPar, ((AliMUONTrackParam*)(GetTrackParamAtCluster()->At(iPar)))->GetClusterPtr()));
	191	}
	192
	193	}
	194
	195	//====================================================================================================================================================
	196
	197	AliMUONTrackParam* AliMuonForwardTrack::GetTrackParamAtMUONCluster(Int_t iMUONCluster) {
	198
	199	if (iMUONCluster<0 \|\| iMUONCluster>=GetNMUONClusters()) {
	200	AliError("Invalid MUON cluster index. NULL pointer will be returned");
	201	return NULL;
	202	}
	203
	204	AliMUONTrackParam trackParam = (AliMUONTrackParam) fMUONTrack->GetTrackParamAtCluster()->At(iMUONCluster);
	205
	206	return trackParam;
	207
	208	}
	209
	210	//====================================================================================================================================================
	211
	212	AliMUONTrackParam* AliMuonForwardTrack::GetTrackParamAtMFTCluster(Int_t iMFTCluster) {
	213
	214	if (iMFTCluster<0 \|\| iMFTCluster>=GetNMFTClusters()) {
	215	AliError("Invalid MFT cluster index. NULL pointer will be returned");
	216	return NULL;
	217	}
	218
	219	AliMUONTrackParam trackParam = (AliMUONTrackParam) GetTrackParamAtCluster()->At(iMFTCluster);
	220
	221	return trackParam;
	222
	223	}
	224
	225	//====================================================================================================================================================
	226
	227	AliMUONVCluster* AliMuonForwardTrack::GetMUONCluster(Int_t iMUONCluster) {
	228
	229	if (iMUONCluster<0 \|\| iMUONCluster>=GetNMUONClusters()) {
	230	AliError("Invalid MUON cluster index. NULL pointer will be returned");
	231	return NULL;
	232	}
	233
	234	AliMUONTrackParam *trackParam = GetTrackParamAtMUONCluster(iMUONCluster);
	235	AliMUONVCluster *muonCluster = trackParam->GetClusterPtr();
	236
	237	return muonCluster;
	238
	239	}
	240
	241	//====================================================================================================================================================
	242
	243	AliMFTCluster* AliMuonForwardTrack::GetMFTCluster(Int_t iMFTCluster) {
	244
	245	if (iMFTCluster<0 \|\| iMFTCluster>=GetNMFTClusters()) {
d4643a10	246	AliError(Form("Invalid MFT cluster index (%d). GetNMFTClusters()=%d. NULL pointer will be returned", iMFTCluster, GetNMFTClusters()));
820b4d9e	247	return NULL;
	248	}
	249
	250	AliMUONTrackParam *trackParam = GetTrackParamAtMFTCluster(iMFTCluster);
d4643a10	251	AliMFTCluster mftCluster = (AliMFTCluster) this->fMFTClusters->At(trackParam->GetUniqueID());
820b4d9e	252
	253	return mftCluster;
	254
	255	}
	256
	257	//====================================================================================================================================================
	258
	259	Double_t AliMuonForwardTrack::RunKalmanFilter(AliMUONTrackParam &trackParamAtCluster) {
	260
	261	AliDebug(1, Form("Running Kalman filter for parameters %p (z = %f) and cluster %p (z = %f)",
	262	&trackParamAtCluster, trackParamAtCluster.GetZ(), trackParamAtCluster.GetClusterPtr(), trackParamAtCluster.GetClusterPtr()->GetZ()));
	263
	264	// Compute new track parameters and their covariances including new cluster using kalman filter
	265	// return the additional track chi2
	266
	267	// Get actual track parameters (p)
	268	TMatrixD param(trackParamAtCluster.GetParameters());
	269
	270	// Get new cluster parameters (m)
	271	AliMUONVCluster *cluster = trackParamAtCluster.GetClusterPtr();
	272	AliDebug(1, Form("cluster->GetX() = %f cluster->GetY() = %f cluster->GetErrX() = %f cluster->GetErrY() = %f",
	273	cluster->GetX(), cluster->GetY(), cluster->GetErrX(), cluster->GetErrY()));
	274	TMatrixD clusterParam(5,1);
	275	clusterParam.Zero();
	276	clusterParam(0,0) = cluster->GetX();
	277	clusterParam(2,0) = cluster->GetY();
	278
	279	// Compute the current parameter weight (W)
	280	TMatrixD paramWeight(trackParamAtCluster.GetCovariances());
	281	if (paramWeight.Determinant() != 0) {
	282	paramWeight.Invert();
	283	} else {
	284	Warning("RunKalmanFilter"," Determinant = 0");
	285	return 1.e10;
	286	}
	287
	288	// Compute the new cluster weight (U)
	289	TMatrixD clusterWeight(5,5);
	290	clusterWeight.Zero();
	291	clusterWeight(0,0) = 1. / cluster->GetErrX2();
	292	clusterWeight(2,2) = 1. / cluster->GetErrY2();
	293
	294	// Compute the new parameters covariance matrix ( (W+U)^-1 )
	295	TMatrixD newParamCov(paramWeight,TMatrixD::kPlus,clusterWeight);
	296	if (newParamCov.Determinant() != 0) {
	297	newParamCov.Invert();
	298	}
	299	else {
	300	Warning("RunKalmanFilter"," Determinant = 0");
	301	return 1.e10;
	302	}
	303
	304	// Save the new parameters covariance matrix
	305	trackParamAtCluster.SetCovariances(newParamCov);
	306
	307	// Compute the new parameters (p' = ((W+U)^-1)U(m-p) + p)
	308	TMatrixD tmp(clusterParam,TMatrixD::kMinus,param);
	309	TMatrixD tmp2(clusterWeight,TMatrixD::kMult,tmp); // U(m-p)
	310	TMatrixD newParam(newParamCov,TMatrixD::kMult,tmp2); // ((W+U)^-1)U(m-p)
	311	newParam += param; // ((W+U)^-1)U(m-p) + p
	312
	313	// Save the new parameters
	314	trackParamAtCluster.SetParameters(newParam);
	315
316	// Compute the additional chi2 (= ((p'-p)^-1)W(p'-p) + ((p'-m)^-1)U(p'-m))
317	tmp = newParam; // p'
318	tmp -= param; // (p'-p)
319	TMatrixD tmp3(paramWeight,TMatrixD::kMult,tmp); // W(p'-p)
320	TMatrixD addChi2Track(tmp,TMatrixD::kTransposeMult,tmp3); // ((p'-p)^-1)W(p'-p)
321	tmp = newParam; // p'
322	tmp -= clusterParam; // (p'-m)
323	TMatrixD tmp4(clusterWeight,TMatrixD::kMult,tmp); // U(p'-m)
324	addChi2Track += TMatrixD(tmp,TMatrixD::kTransposeMult,tmp4); // ((p'-p)^-1)W(p'-p) + ((p'-m)^-1)U(p'-m)
325
326	AliDebug(1,Form("Adding Kalman chi2 = %f",addChi2Track(0,0)));
327
328	return addChi2Track(0,0);
329
330	}
331
332	//====================================================================================================================================================
333
334	Double_t AliMuonForwardTrack::GetWeightedOffset(Double_t x, Double_t y, Double_t z) {
335
336	AliMUONTrackParam *param = GetTrackParamAtMFTCluster(0);
337	AliMUONTrackExtrap::ExtrapToZCov(param, z);
338
339	TMatrixD cov(5,5);
340	cov = param->GetCovariances();
341
342	TMatrixD covCoordinates(2,2);
343	covCoordinates(0,0) = cov(0,0);
344	covCoordinates(0,1) = cov(0,2);
345	covCoordinates(1,0) = cov(2,0);
346	covCoordinates(1,1) = cov(2,2);
347
348	TMatrixD covCoordinatesInverse = covCoordinates.Invert();
349
350	Double_t dX = param->GetNonBendingCoor() - x;
351	Double_t dY = param->GetBendingCoor() - y;
352
353	Double_t weightedOffset = TMath::Sqrt(0.5(dXdX*covCoordinatesInverse(0,0) +
354	dYdYcovCoordinatesInverse(1,1) +
355	2.dXdY*covCoordinatesInverse(0,1)));
356
357	return weightedOffset;
358
359	}
360
361	//====================================================================================================================================================
362
363	Double_t AliMuonForwardTrack::GetOffsetX(Double_t x, Double_t z) {
364
365	AliMUONTrackParam *param = GetTrackParamAtMFTCluster(0);
366	AliMUONTrackExtrap::ExtrapToZCov(param, z);
367	Double_t dX = param->GetNonBendingCoor() - x;
368	return dX;
369
370	}
371
372	//====================================================================================================================================================
373
374	Double_t AliMuonForwardTrack::GetOffsetY(Double_t y, Double_t z) {
375
376	AliMUONTrackParam *param = GetTrackParamAtMFTCluster(0);
377	AliMUONTrackExtrap::ExtrapToZCov(param, z);
378	Double_t dY = param->GetBendingCoor() - y;
379	return dY;
380
381	}
382
383	//====================================================================================================================================================
384
385	Double_t AliMuonForwardTrack::GetOffset(Double_t x, Double_t y, Double_t z) {
386
387	AliMUONTrackParam *param = GetTrackParamAtMFTCluster(0);
388	AliMUONTrackExtrap::ExtrapToZCov(param, z);
389	Double_t dX = param->GetNonBendingCoor() - x;
390	Double_t dY = param->GetBendingCoor() - y;
391	return TMath::Sqrt(dXdX + dYdY);
392
393	}
394
395	//====================================================================================================================================================
396