[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)
{

  // 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)
{

  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)
{

  // 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;

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