[u/mrichter/AliRoot.git] / STEER / STEERBase / AliTRDPIDResponse.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.                  *
**************************************************************************/
//
// PID Response class for the TRD detector
// Based on 1D Likelihood approach
// Calculation of probabilities using Bayesian approach
// Attention: This method is only used to separate electrons from pions
//
// Authors:
//  Markus Fasel <M.Fasel@gsi.de>
//  Anton Andronic <A.Andronic@gsi.de>
//
#include <TAxis.h>
#include <TClass.h>
#include <TDirectory.h>
#include <TFile.h>
#include <TH1.h>
#include <TKey.h>
#include <TMath.h>
#include <TObjArray.h>
#include <TROOT.h> 
#include <TString.h>
#include <TSystem.h>

#include "AliLog.h"

#include "AliTRDPIDResponseObject.h"
#include "AliTRDPIDResponse.h"
//#include "AliTRDTKDInterpolator.h"
#include "AliTRDNDFast.h"

ClassImp(AliTRDPIDResponse)

//____________________________________________________________
AliTRDPIDResponse::AliTRDPIDResponse():
  TObject()
  ,fkPIDResponseObject(NULL)
  ,fGainNormalisationFactor(1.)
{
  //
  // Default constructor
  //
}

//____________________________________________________________
AliTRDPIDResponse::AliTRDPIDResponse(const AliTRDPIDResponse &ref):
  TObject(ref)
  ,fkPIDResponseObject(NULL)
  ,fGainNormalisationFactor(ref.fGainNormalisationFactor)
{
  //
  // Copy constructor
  //
}

//____________________________________________________________
AliTRDPIDResponse &AliTRDPIDResponse::operator=(const AliTRDPIDResponse &ref){
  //
  // Assignment operator
  //
  if(this == &ref) return *this;
  
  // Make copy
  TObject::operator=(ref);
  fGainNormalisationFactor = ref.fGainNormalisationFactor;
  fkPIDResponseObject = ref.fkPIDResponseObject;
  
  return *this;
}

//____________________________________________________________
AliTRDPIDResponse::~AliTRDPIDResponse(){
  //
  // Destructor
  //
    if(IsOwner()) delete fkPIDResponseObject;
}

//____________________________________________________________
Bool_t AliTRDPIDResponse::Load(const Char_t * filename){
  //
  // Load References into the toolkit
  //
  AliDebug(1, "Loading reference histos from root file");
  TDirectory *owd = gDirectory;// store old working directory
  
  if(!filename)
    filename = Form("%s/STEER/LQ1dRef_v1.root",gSystem->ExpandPathName("$ALICE_ROOT"));
  TFile *in = TFile::Open(filename);
  if(!in){
    AliError("Ref file not available.");
    return kFALSE;
  }
  
  gROOT->cd();
  fkPIDResponseObject = dynamic_cast<const AliTRDPIDResponseObject *>(in->Get("TRDPIDResponse")->Clone());
  in->Close(); delete in;
  owd->cd();
  SetBit(kIsOwner, kTRUE);
  AliDebug(2, Form("Successfully loaded References for %d Momentum bins", fkPIDResponseObject->GetNumberOfMomentumBins()));
  return kTRUE;
}

//____________________________________________________________
Int_t AliTRDPIDResponse::GetResponse(Int_t n, const Double_t * const dedx, const Float_t * const p, Double_t prob[AliPID::kSPECIES],ETRDPIDMethod PIDmethod,Bool_t kNorm) const
{
  //
  // Calculate TRD likelihood values for the track based on dedx and 
  // momentum values. The likelihoods are calculated by query the 
  // reference data depending on the PID method selected
  //
  // Input parameter :
  //   n - number of dedx slices/chamber
  //   dedx - array of dedx slices organized layer wise
  //   p - array of momentum measurements organized layer wise
  // 
  // Return parameters
  //   prob - probabilities allocated by TRD for particle specis
  //   kNorm - switch to normalize probabilities to 1. By default true. If false return not normalized prob.
  // 
  // Return value
  //   number of tracklets used for PID, 0 if no PID
    //
    AliDebug(3,Form(" Response for PID method: %d",PIDmethod));


    if(!fkPIDResponseObject){
	AliDebug(3,"Missing reference data. PID calculation not possible.");
	return 0;
    }

    for(Int_t is(AliPID::kSPECIES); is--;) prob[is]=.2;
    Double_t prLayer[AliPID::kSPECIES];
    Double_t dE[10], s(0.);
    Int_t ntrackletsPID=0;
    for(Int_t il(kNlayer); il--;){
	memset(prLayer, 0, AliPID::kSPECIES*sizeof(Double_t));
	if(!CookdEdx(n, &dedx[il*n], &dE[0],PIDmethod)) continue;
        s=0.;
        Bool_t filled=kTRUE;
	for(Int_t is(AliPID::kSPECIES); is--;){
	    //if((PIDmethod==kLQ2D)&&(!(is==0||is==2)))continue;
	    if((dE[0] > 0.) && (p[il] > 0.)) prLayer[is] = GetProbabilitySingleLayer(is, p[il], &dE[0],PIDmethod);
	    AliDebug(3, Form("Probability for Species %d in Layer %d: %e", is, il, prLayer[is]));
	    if(prLayer[is]<1.e-30){
		AliDebug(2, Form("Null for species %d species prob layer[%d].",is,il));
		filled=kFALSE;
		break;
	    }
	    s+=prLayer[is];
	}
	if(!filled){
	    continue;
	}
	if(s<1.e-30){
	    AliDebug(2, Form("Null all species prob layer[%d].", il));
	    continue;
	}
	for(Int_t is(AliPID::kSPECIES); is--;){
	    if(kNorm) prLayer[is] /= s;
	    prob[is] *= prLayer[is];
	}
	ntrackletsPID++;
    }
    if(!kNorm) return ntrackletsPID;

    s=0.;
    for(Int_t is(AliPID::kSPECIES); is--;) s+=prob[is];
    if(s<1.e-30){
	AliDebug(2, "Null total prob.");
	return 0;
    }
    for(Int_t is(AliPID::kSPECIES); is--;) prob[is]/=s;
    return ntrackletsPID;
}

//____________________________________________________________
Double_t AliTRDPIDResponse::GetProbabilitySingleLayer(Int_t species, Double_t plocal, Double_t *dEdx,ETRDPIDMethod PIDmethod) const {
  //
  // Get the non-normalized probability for a certain particle species as coming
  // from the reference histogram
  // Interpolation between momentum bins
  //
  AliDebug(1, Form("Make Probability for Species %d with Momentum %f", species, plocal));

  Double_t probLayer = 0.;

  Float_t pLower, pUpper;
	
  AliTRDNDFast *refUpper = dynamic_cast<AliTRDNDFast *>(fkPIDResponseObject->GetUpperReference((AliPID::EParticleType)species, plocal, pUpper,PIDmethod)),
      *refLower = dynamic_cast<AliTRDNDFast *>(fkPIDResponseObject->GetLowerReference((AliPID::EParticleType)species, plocal, pLower,PIDmethod));

  // Do Interpolation exept for underflow and overflow
  if(refLower && refUpper){
      Double_t probLower = refLower->Eval(dEdx);
      Double_t probUpper = refUpper->Eval(dEdx);

      probLayer = probLower + (probUpper - probLower)/(pUpper-pLower) * (plocal - pLower);
  } else if(refLower){
     // underflow
      probLayer = refLower->Eval(dEdx);
  } else if(refUpper){
      // overflow
      probLayer = refUpper->Eval(dEdx);
  } else {
      AliError("No references available");
  }
  AliDebug(1, Form("Eval 1D dEdx %f Probability %e", dEdx[0],probLayer));

  return probLayer;

/* old implementation

switch(PIDmethod){
case kNN: // NN
      break;
  case kLQ2D: // 2D LQ
      {
	  if(species==0||species==2){ // references only for electrons and pions
	      Double_t error = 0.;
	      Double_t point[kNslicesLQ2D];
	      for(Int_t idim=0;idim<kNslicesLQ2D;idim++){point[idim]=dEdx[idim];}

	      AliTRDTKDInterpolator *refUpper = dynamic_cast<AliTRDTKDInterpolator *>(fkPIDResponseObject->GetUpperReference((AliPID::EParticleType)species, plocal, pUpper,kLQ2D)),
	      *refLower = dynamic_cast<AliTRDTKDInterpolator *>(fkPIDResponseObject->GetLowerReference((AliPID::EParticleType)species, plocal, pLower,kLQ2D));
	      // Do Interpolation exept for underflow and overflow
	      if(refLower && refUpper){
                  Double_t probLower=0,probUpper=0;
		  refLower->Eval(point,probLower,error);
                  refUpper->Eval(point,probUpper,error);
		  probLayer = probLower + (probUpper - probLower)/(pUpper-pLower) * (plocal - pLower);
	      } else if(refLower){
		  // underflow
		  refLower->Eval(point,probLayer,error);
		  } else if(refUpper){
		  // overflow
		  refUpper->Eval(point,probLayer,error);
	      } else {
		  AliError("No references available");
	      }
	      AliDebug(2,Form("Eval 2D Q0 %f Q1 %f P %e Err %e",point[0],point[1],probLayer,error));
	  }
      }
      break;
  case kLQ1D: // 1D LQ
      {
	  TH1 *refUpper = dynamic_cast<TH1 *>(fkPIDResponseObject->GetUpperReference((AliPID::EParticleType)species, plocal, pUpper,kLQ1D)),
	      *refLower = dynamic_cast<TH1 *>(fkPIDResponseObject->GetLowerReference((AliPID::EParticleType)species, plocal, pLower,kLQ1D));
	  // Do Interpolation exept for underflow and overflow
	  if(refLower && refUpper){
	      Double_t probLower = refLower->GetBinContent(refLower->GetXaxis()->FindBin(dEdx[0]));
	      Double_t probUpper = refUpper->GetBinContent(refUpper->GetXaxis()->FindBin(dEdx[0]));

	      probLayer = probLower + (probUpper - probLower)/(pUpper-pLower) * (plocal - pLower);
	  } else if(refLower){
	      // underflow
	      probLayer = refLower->GetBinContent(refLower->GetXaxis()->FindBin(dEdx[0]));
	  } else if(refUpper){
	      // overflow
	      probLayer = refUpper->GetBinContent(refUpper->GetXaxis()->FindBin(dEdx[0]));
	  } else {
	      AliError("No references available");
	  }
	  AliDebug(1, Form("Eval 1D dEdx %f Probability %e", dEdx[0],probLayer));
      }
      break;
  default:
      break;
      }
      return probLayer;
      */

}

//____________________________________________________________
void AliTRDPIDResponse::SetOwner(){
  //
  // Make Deep Copy of the Reference Histograms
  //
    if(!fkPIDResponseObject || IsOwner()) return;
    const AliTRDPIDResponseObject *tmp = fkPIDResponseObject;
    fkPIDResponseObject = dynamic_cast<const AliTRDPIDResponseObject *>(tmp->Clone());
    SetBit(kIsOwner, kTRUE);
}

//____________________________________________________________
Bool_t AliTRDPIDResponse::CookdEdx(Int_t nSlice, const Double_t * const in, Double_t *out,ETRDPIDMethod PIDmethod) const
{
    //
    // Recalculate dE/dx
    //
  switch(PIDmethod){
  case kNN: // NN 
      break;
  case kLQ2D: // 2D LQ
      out[0]=0;
      out[1]=0;
      for(Int_t islice = 0; islice < nSlice; islice++){
	  if(in[islice]<=0){out[0]=0;out[1]=0;return kFALSE;}  // Require that all slices are filled
	  if(islice<fkPIDResponseObject->GetNSlicesQ0())out[0]+= in[islice];
	  else out[1]+= in[islice];
      }
      // normalize signal to number of slices
      out[0]*=1./Double_t(fkPIDResponseObject->GetNSlicesQ0());
      out[1]*=1./Double_t(nSlice-fkPIDResponseObject->GetNSlicesQ0());
      if(out[0] < 1e-6) return kFALSE;
      AliDebug(3,Form("CookdEdx Q0 %f Q1 %f",out[0],out[1]));
      break;
  case kLQ1D: // 1D LQ
      out[0]= 0.;
      for(Int_t islice = 0; islice < nSlice; islice++)
	  if(in[islice] > 0) out[0] += in[islice] * fGainNormalisationFactor;   // Protect against negative values for slices having no dE/dx information
      out[0]*=1./Double_t(nSlice);
      if(out[0] < 1e-6) return kFALSE;
      AliDebug(3,Form("CookdEdx dEdx %f",out[0]));
      break;

  default:
      return kFALSE;
  }
  return kTRUE;
}

//____________________________________________________________
Bool_t AliTRDPIDResponse::IdentifiedAsElectron(Int_t nTracklets, const Double_t *like, Double_t p, Double_t level,Double_t centrality,ETRDPIDMethod PIDmethod) const {
    //
    // Check whether particle is identified as electron assuming a certain electron efficiency level
    // Only electron and pion hypothesis is taken into account
    //
    // Inputs:
    //         Number of tracklets
    //         Likelihood values
    //         Momentum
    //         Electron efficiency level
    //
    // If the function fails when the params are not accessible, the function returns true
    //
  if(!fkPIDResponseObject){
    AliDebug(3,"No PID Param object available");
    return kTRUE;
  } 
  Double_t probEle = like[AliPID::kElectron]/(like[AliPID::kElectron] + like[AliPID::kPion]);
  Double_t params[4];
  if(!fkPIDResponseObject->GetThresholdParameters(nTracklets, level, params,centrality,PIDmethod)){
    AliError("No Params found for the given configuration");
    return kTRUE;
  }
  Double_t threshold = 1. - params[0] - params[1] * p - params[2] * TMath::Exp(-params[3] * p);
  if(probEle > TMath::Max(TMath::Min(threshold, 0.99), 0.2)) return kTRUE; // truncate the threshold upperwards to 0.999 and lowerwards to 0.2 and exclude unphysical values
  return kFALSE;
}

//____________________________________________________________
Bool_t AliTRDPIDResponse::SetPIDResponseObject(const AliTRDPIDResponseObject * obj){

    fkPIDResponseObject = obj;
    if((AliLog::GetDebugLevel("",IsA()->GetName()))>0)fkPIDResponseObject->Print("");
    return kTRUE;
}
Commit	Line	Data
ffb1ee30	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	// PID Response class for the TRD detector
	17	// Based on 1D Likelihood approach
	18	// Calculation of probabilities using Bayesian approach
	19	// Attention: This method is only used to separate electrons from pions
	20	//
	21	// Authors:
	22	// Markus Fasel <M.Fasel@gsi.de>
	23	// Anton Andronic <A.Andronic@gsi.de>
	24	//
ffb1ee30	25	#include <TAxis.h>
ea235c90	26	#include <TClass.h>
ea235c90	27	#include <TDirectory.h>
ffb1ee30	28	#include <TFile.h>
ffb1ee30	29	#include <TH1.h>
ce5d6908	30	#include <TKey.h>
ea235c90	31	#include <TMath.h>
ffb1ee30	32	#include <TObjArray.h>
ce5d6908	33	#include <TROOT.h>
ea235c90	34	#include <TString.h>
ffb1ee30	35	#include <TSystem.h>
	36
	37	#include "AliLog.h"
	38
db0e2c5f	39	#include "AliTRDPIDResponseObject.h"
ffb1ee30	40	#include "AliTRDPIDResponse.h"
239fe91c	41	//#include "AliTRDTKDInterpolator.h"
239fe91c	42	#include "AliTRDNDFast.h"
ffb1ee30	43
	44	ClassImp(AliTRDPIDResponse)
	45
ffb1ee30	46	//____________________________________________________________
e0de37e9	47	AliTRDPIDResponse::AliTRDPIDResponse():
e0de37e9	48	TObject()
db0e2c5f	49	,fkPIDResponseObject(NULL)
e0de37e9	50	,fGainNormalisationFactor(1.)
ffb1ee30	51	{
e0de37e9	52	//
	53	// Default constructor
	54	//
ffb1ee30	55	}
	56
	57	//____________________________________________________________
	58	AliTRDPIDResponse::AliTRDPIDResponse(const AliTRDPIDResponse &ref):
e0de37e9	59	TObject(ref)
db0e2c5f	60	,fkPIDResponseObject(NULL)
e0de37e9	61	,fGainNormalisationFactor(ref.fGainNormalisationFactor)
ffb1ee30	62	{
e0de37e9	63	//
e0de37e9	64	// Copy constructor
e0de37e9	65	//
ffb1ee30	66	}
	67
	68	//____________________________________________________________
	69	AliTRDPIDResponse &AliTRDPIDResponse::operator=(const AliTRDPIDResponse &ref){
e0de37e9	70	//
e0de37e9	71	// Assignment operator
e0de37e9	72	//
	73	if(this == &ref) return *this;
	74
	75	// Make copy
	76	TObject::operator=(ref);
51a0ce25	77	fGainNormalisationFactor = ref.fGainNormalisationFactor;
db0e2c5f	78	fkPIDResponseObject = ref.fkPIDResponseObject;
e0de37e9	79
e0de37e9	80	return *this;
ffb1ee30	81	}
	82
	83	//____________________________________________________________
	84	AliTRDPIDResponse::~AliTRDPIDResponse(){
e0de37e9	85	//
	86	// Destructor
	87	//
db0e2c5f	88	if(IsOwner()) delete fkPIDResponseObject;
ffb1ee30	89	}
	90
	91	//____________________________________________________________
db0e2c5f	92	Bool_t AliTRDPIDResponse::Load(const Char_t * filename){
e0de37e9	93	//
	94	// Load References into the toolkit
	95	//
	96	AliDebug(1, "Loading reference histos from root file");
2ad33025	97	TDirectory *owd = gDirectory;// store old working directory
e0de37e9	98
	99	if(!filename)
	100	filename = Form("%s/STEER/LQ1dRef_v1.root",gSystem->ExpandPathName("$ALICE_ROOT"));
	101	TFile *in = TFile::Open(filename);
	102	if(!in){
	103	AliError("Ref file not available.");
	104	return kFALSE;
	105	}
	106
	107	gROOT->cd();
db0e2c5f	108	fkPIDResponseObject = dynamic_cast<const AliTRDPIDResponseObject *>(in->Get("TRDPIDResponse")->Clone());
51a0ce25	109	in->Close(); delete in;
e0de37e9	110	owd->cd();
e0de37e9	111	SetBit(kIsOwner, kTRUE);
db0e2c5f	112	AliDebug(2, Form("Successfully loaded References for %d Momentum bins", fkPIDResponseObject->GetNumberOfMomentumBins()));
e0de37e9	113	return kTRUE;
ffb1ee30	114	}
	115
	116	//____________________________________________________________
239fe91c	117	Int_t AliTRDPIDResponse::GetResponse(Int_t n, const Double_t * const dedx, const Float_t * const p, Double_t prob[AliPID::kSPECIES],ETRDPIDMethod PIDmethod,Bool_t kNorm) const
ffb1ee30	118	{
e0de37e9	119	//
	120	// Calculate TRD likelihood values for the track based on dedx and
	121	// momentum values. The likelihoods are calculated by query the
	122	// reference data depending on the PID method selected
	123	//
	124	// Input parameter :
	125	// n - number of dedx slices/chamber
	126	// dedx - array of dedx slices organized layer wise
	127	// p - array of momentum measurements organized layer wise
	128	//
	129	// Return parameters
	130	// prob - probabilities allocated by TRD for particle specis
	131	// kNorm - switch to normalize probabilities to 1. By default true. If false return not normalized prob.
	132	//
	133	// Return value
239fe91c	134	// number of tracklets used for PID, 0 if no PID
bd58d4b9	135	//
	136	AliDebug(3,Form(" Response for PID method: %d",PIDmethod));
	137
ffb1ee30	138
db0e2c5f	139	if(!fkPIDResponseObject){
31746593	140	AliDebug(3,"Missing reference data. PID calculation not possible.");
239fe91c	141	return 0;
db0e2c5f	142	}
ffb1ee30	143
db0e2c5f	144	for(Int_t is(AliPID::kSPECIES); is--;) prob[is]=.2;
	145	Double_t prLayer[AliPID::kSPECIES];
	146	Double_t dE[10], s(0.);
239fe91c	147	Int_t ntrackletsPID=0;
db0e2c5f	148	for(Int_t il(kNlayer); il--;){
db0e2c5f	149	memset(prLayer, 0, AliPID::kSPECIES*sizeof(Double_t));
bd58d4b9	150	if(!CookdEdx(n, &dedx[il*n], &dE[0],PIDmethod)) continue;
239fe91c	151	s=0.;
db0e2c5f	152	Bool_t filled=kTRUE;
db0e2c5f	153	for(Int_t is(AliPID::kSPECIES); is--;){
239fe91c	154	//if((PIDmethod==kLQ2D)&&(!(is==0\|\|is==2)))continue;
bd58d4b9	155	if((dE[0] > 0.) && (p[il] > 0.)) prLayer[is] = GetProbabilitySingleLayer(is, p[il], &dE[0],PIDmethod);
f2762b1c	156	AliDebug(3, Form("Probability for Species %d in Layer %d: %e", is, il, prLayer[is]));
db0e2c5f	157	if(prLayer[is]<1.e-30){
	158	AliDebug(2, Form("Null for species %d species prob layer[%d].",is,il));
	159	filled=kFALSE;
	160	break;
	161	}
	162	s+=prLayer[is];
	163	}
	164	if(!filled){
	165	continue;
	166	}
	167	if(s<1.e-30){
	168	AliDebug(2, Form("Null all species prob layer[%d].", il));
	169	continue;
	170	}
	171	for(Int_t is(AliPID::kSPECIES); is--;){
	172	if(kNorm) prLayer[is] /= s;
	173	prob[is] *= prLayer[is];
	174	}
239fe91c	175	ntrackletsPID++;
e0de37e9	176	}
239fe91c	177	if(!kNorm) return ntrackletsPID;
db0e2c5f	178
	179	s=0.;
	180	for(Int_t is(AliPID::kSPECIES); is--;) s+=prob[is];
e0de37e9	181	if(s<1.e-30){
db0e2c5f	182	AliDebug(2, "Null total prob.");
239fe91c	183	return 0;
e0de37e9	184	}
db0e2c5f	185	for(Int_t is(AliPID::kSPECIES); is--;) prob[is]/=s;
239fe91c	186	return ntrackletsPID;
ffb1ee30	187	}
ffb1ee30	188
ffb1ee30	189	//____________________________________________________________
bd58d4b9	190	Double_t AliTRDPIDResponse::GetProbabilitySingleLayer(Int_t species, Double_t plocal, Double_t *dEdx,ETRDPIDMethod PIDmethod) const {
e0de37e9	191	//
	192	// Get the non-normalized probability for a certain particle species as coming
	193	// from the reference histogram
	194	// Interpolation between momentum bins
	195	//
	196	AliDebug(1, Form("Make Probability for Species %d with Momentum %f", species, plocal));
db0e2c5f	197
51a0ce25	198	Double_t probLayer = 0.;
239fe91c	199
db0e2c5f	200	Float_t pLower, pUpper;
db0e2c5f	201
239fe91c	202	AliTRDNDFast refUpper = dynamic_cast<AliTRDNDFast >(fkPIDResponseObject->GetUpperReference((AliPID::EParticleType)species, plocal, pUpper,PIDmethod)),
	203	refLower = dynamic_cast<AliTRDNDFast >(fkPIDResponseObject->GetLowerReference((AliPID::EParticleType)species, plocal, pLower,PIDmethod));
	204
	205	// Do Interpolation exept for underflow and overflow
	206	if(refLower && refUpper){
	207	Double_t probLower = refLower->Eval(dEdx);
	208	Double_t probUpper = refUpper->Eval(dEdx);
	209
	210	probLayer = probLower + (probUpper - probLower)/(pUpper-pLower) * (plocal - pLower);
	211	} else if(refLower){
	212	// underflow
	213	probLayer = refLower->Eval(dEdx);
	214	} else if(refUpper){
	215	// overflow
	216	probLayer = refUpper->Eval(dEdx);
	217	} else {
	218	AliError("No references available");
	219	}
	220	AliDebug(1, Form("Eval 1D dEdx %f Probability %e", dEdx[0],probLayer));
	221
	222	return probLayer;
	223
	224	/* old implementation
	225
	226	switch(PIDmethod){
	227	case kNN: // NN
db0e2c5f	228	break;
	229	case kLQ2D: // 2D LQ
	230	{
f2762b1c	231	if(species==0\|\|species==2){ // references only for electrons and pions
2285168d	232	Double_t error = 0.;
f2762b1c	233	Double_t point[kNslicesLQ2D];
f2762b1c	234	for(Int_t idim=0;idim<kNslicesLQ2D;idim++){point[idim]=dEdx[idim];}
db0e2c5f	235
239fe91c	236	AliTRDTKDInterpolator refUpper = dynamic_cast<AliTRDTKDInterpolator >(fkPIDResponseObject->GetUpperReference((AliPID::EParticleType)species, plocal, pUpper,kLQ2D)),
	237	refLower = dynamic_cast<AliTRDTKDInterpolator >(fkPIDResponseObject->GetLowerReference((AliPID::EParticleType)species, plocal, pLower,kLQ2D));
	238	// Do Interpolation exept for underflow and overflow
	239	if(refLower && refUpper){
	240	Double_t probLower=0,probUpper=0;
	241	refLower->Eval(point,probLower,error);
	242	refUpper->Eval(point,probUpper,error);
	243	probLayer = probLower + (probUpper - probLower)/(pUpper-pLower) * (plocal - pLower);
	244	} else if(refLower){
	245	// underflow
f2762b1c	246	refLower->Eval(point,probLayer,error);
239fe91c	247	} else if(refUpper){
	248	// overflow
	249	refUpper->Eval(point,probLayer,error);
	250	} else {
f2762b1c	251	AliError("No references available");
	252	}
	253	AliDebug(2,Form("Eval 2D Q0 %f Q1 %f P %e Err %e",point[0],point[1],probLayer,error));
db0e2c5f	254	}
	255	}
	256	break;
	257	case kLQ1D: // 1D LQ
	258	{
	259	TH1 refUpper = dynamic_cast<TH1 >(fkPIDResponseObject->GetUpperReference((AliPID::EParticleType)species, plocal, pUpper,kLQ1D)),
	260	refLower = dynamic_cast<TH1 >(fkPIDResponseObject->GetLowerReference((AliPID::EParticleType)species, plocal, pLower,kLQ1D));
	261	// Do Interpolation exept for underflow and overflow
	262	if(refLower && refUpper){
	263	Double_t probLower = refLower->GetBinContent(refLower->GetXaxis()->FindBin(dEdx[0]));
	264	Double_t probUpper = refUpper->GetBinContent(refUpper->GetXaxis()->FindBin(dEdx[0]));
	265
	266	probLayer = probLower + (probUpper - probLower)/(pUpper-pLower) * (plocal - pLower);
	267	} else if(refLower){
	268	// underflow
	269	probLayer = refLower->GetBinContent(refLower->GetXaxis()->FindBin(dEdx[0]));
	270	} else if(refUpper){
	271	// overflow
	272	probLayer = refUpper->GetBinContent(refUpper->GetXaxis()->FindBin(dEdx[0]));
	273	} else {
	274	AliError("No references available");
	275	}
f2762b1c	276	AliDebug(1, Form("Eval 1D dEdx %f Probability %e", dEdx[0],probLayer));
db0e2c5f	277	}
	278	break;
	279	default:
	280	break;
239fe91c	281	}
	282	return probLayer;
	283	*/
	284
ffb1ee30	285	}
	286
	287	//____________________________________________________________
	288	void AliTRDPIDResponse::SetOwner(){
e0de37e9	289	//
	290	// Make Deep Copy of the Reference Histograms
	291	//
db0e2c5f	292	if(!fkPIDResponseObject \|\| IsOwner()) return;
	293	const AliTRDPIDResponseObject *tmp = fkPIDResponseObject;
	294	fkPIDResponseObject = dynamic_cast<const AliTRDPIDResponseObject *>(tmp->Clone());
	295	SetBit(kIsOwner, kTRUE);
ffb1ee30	296	}
	297
	298	//____________________________________________________________
bd58d4b9	299	Bool_t AliTRDPIDResponse::CookdEdx(Int_t nSlice, const Double_t * const in, Double_t *out,ETRDPIDMethod PIDmethod) const
ffb1ee30	300	{
f2762b1c	301	//
	302	// Recalculate dE/dx
	303	//
bd58d4b9	304	switch(PIDmethod){
e0de37e9	305	case kNN: // NN
db0e2c5f	306	break;
	307	case kLQ2D: // 2D LQ
	308	out[0]=0;
	309	out[1]=0;
	310	for(Int_t islice = 0; islice < nSlice; islice++){
239fe91c	311	if(in[islice]<=0){out[0]=0;out[1]=0;return kFALSE;} // Require that all slices are filled
db0e2c5f	312	if(islice<fkPIDResponseObject->GetNSlicesQ0())out[0]+= in[islice];
	313	else out[1]+= in[islice];
	314	}
239fe91c	315	// normalize signal to number of slices
	316	out[0]*=1./Double_t(fkPIDResponseObject->GetNSlicesQ0());
	317	out[1]*=1./Double_t(nSlice-fkPIDResponseObject->GetNSlicesQ0());
f2762b1c	318	if(out[0] < 1e-6) return kFALSE;
f2762b1c	319	AliDebug(3,Form("CookdEdx Q0 %f Q1 %f",out[0],out[1]));
db0e2c5f	320	break;
	321	case kLQ1D: // 1D LQ
	322	out[0]= 0.;
	323	for(Int_t islice = 0; islice < nSlice; islice++)
	324	if(in[islice] > 0) out[0] += in[islice] * fGainNormalisationFactor; // Protect against negative values for slices having no dE/dx information
239fe91c	325	out[0]*=1./Double_t(nSlice);
db0e2c5f	326	if(out[0] < 1e-6) return kFALSE;
f2762b1c	327	AliDebug(3,Form("CookdEdx dEdx %f",out[0]));
db0e2c5f	328	break;
db0e2c5f	329
e0de37e9	330	default:
db0e2c5f	331	return kFALSE;
e0de37e9	332	}
e0de37e9	333	return kTRUE;
ffb1ee30	334	}
ffb1ee30	335
ea235c90	336	//____________________________________________________________
bd58d4b9	337	Bool_t AliTRDPIDResponse::IdentifiedAsElectron(Int_t nTracklets, const Double_t *like, Double_t p, Double_t level,Double_t centrality,ETRDPIDMethod PIDmethod) const {
db0e2c5f	338	//
	339	// Check whether particle is identified as electron assuming a certain electron efficiency level
	340	// Only electron and pion hypothesis is taken into account
	341	//
	342	// Inputs:
	343	// Number of tracklets
	344	// Likelihood values
	345	// Momentum
	346	// Electron efficiency level
	347	//
	348	// If the function fails when the params are not accessible, the function returns true
	349	//
	350	if(!fkPIDResponseObject){
31746593	351	AliDebug(3,"No PID Param object available");
ea235c90	352	return kTRUE;
	353	}
	354	Double_t probEle = like[AliPID::kElectron]/(like[AliPID::kElectron] + like[AliPID::kPion]);
ce487a7f	355	Double_t params[4];
bd58d4b9	356	if(!fkPIDResponseObject->GetThresholdParameters(nTracklets, level, params,centrality,PIDmethod)){
ea235c90	357	AliError("No Params found for the given configuration");
	358	return kTRUE;
	359	}
ce487a7f	360	Double_t threshold = 1. - params[0] - params[1] * p - params[2] * TMath::Exp(-params[3] * p);
ea235c90	361	if(probEle > TMath::Max(TMath::Min(threshold, 0.99), 0.2)) return kTRUE; // truncate the threshold upperwards to 0.999 and lowerwards to 0.2 and exclude unphysical values
	362	return kFALSE;
	363	}
	364
f2762b1c	365	//____________________________________________________________
	366	Bool_t AliTRDPIDResponse::SetPIDResponseObject(const AliTRDPIDResponseObject * obj){
	367
	368	fkPIDResponseObject = obj;
	369	if((AliLog::GetDebugLevel("",IsA()->GetName()))>0)fkPIDResponseObject->Print("");
	370	return kTRUE;
	371	}