[u/mrichter/AliRoot.git] / PWG2 / FORWARD / analysis2 / AliFMDSharingFilter.cxx

//
// Class to do the sharing correction.  That is, a filter that merges 
// adjacent strip signals presumably originating from a single particle 
// that impinges on the detector in such a way that it deposite energy 
// into two or more strips. 
//
// Input: 
//    - AliESDFMD object  - from reconstruction
//
// Output: 
//    - AliESDFMD object  - copy of input, but with signals merged 
//
// Corrections used: 
//    - AliFMDCorrELossFit
//
// Histograms: 
//    - For each ring (FMD1i, FMD2i, FMD2o, FMD3i, FMD3o) the distribution of 
//      signals before and after the filter.  
//    - For each ring (see above), an array of distributions of number of 
//      hit strips for each vertex bin (if enabled - see Init method)
// 
//
//
#include "AliFMDSharingFilter.h"
#include <AliESDFMD.h>
#include <TAxis.h>
#include <TList.h>
#include <TH1.h>
#include <TMath.h>
#include "AliForwardCorrectionManager.h"
#include <AliLog.h>
#include <TROOT.h>
#include <iostream>
#include <iomanip>

ClassImp(AliFMDSharingFilter)
#if 0
; // This is for Emacs
#endif 


//____________________________________________________________________
AliFMDSharingFilter::AliFMDSharingFilter()
  : TNamed(), 
    fRingHistos(),
    fLowCut(0.),
    fCorrectAngles(kFALSE), 
    fNXi(1),
    fDebug(0)
{
  // 
  // Default Constructor - do not use 
  //
}

//____________________________________________________________________
AliFMDSharingFilter::AliFMDSharingFilter(const char* title)
  : TNamed("fmdSharingFilter", title), 
    fRingHistos(), 
    fLowCut(0.),
    fCorrectAngles(kFALSE), 
    fNXi(1),
    fDebug(0)
{
  // 
  // Constructor 
  // 
  // Parameters:
  //    title Title of object  - not significant 
  //
  fRingHistos.Add(new RingHistos(1, 'I'));
  fRingHistos.Add(new RingHistos(2, 'I'));
  fRingHistos.Add(new RingHistos(2, 'O'));
  fRingHistos.Add(new RingHistos(3, 'I'));
  fRingHistos.Add(new RingHistos(3, 'O'));
}

//____________________________________________________________________
AliFMDSharingFilter::AliFMDSharingFilter(const AliFMDSharingFilter& o)
  : TNamed(o), 
    fRingHistos(), 
    fLowCut(o.fLowCut),
    fCorrectAngles(o.fCorrectAngles), 
    fNXi(o.fNXi),
    fDebug(o.fDebug)
{
  // 
  // Copy constructor 
  // 
  // Parameters:
  //    o Object to copy from 
  //
  TIter    next(&o.fRingHistos);
  TObject* obj = 0;
  while ((obj = next())) fRingHistos.Add(obj);
}

//____________________________________________________________________
AliFMDSharingFilter::~AliFMDSharingFilter()
{
  // 
  // Destructor
  //
  fRingHistos.Delete();
}

//____________________________________________________________________
AliFMDSharingFilter&
AliFMDSharingFilter::operator=(const AliFMDSharingFilter& o)
{
  // 
  // Assignment operator 
  // 
  // Parameters:
  //    o Object to assign from 
  // 
  // Return:
  //    Reference to this 
  //
  TNamed::operator=(o);

  fLowCut        = o.fLowCut;
  fCorrectAngles = o.fCorrectAngles;
  fNXi           = o.fNXi;
  fDebug         = o.fDebug;

  fRingHistos.Delete();
  TIter    next(&o.fRingHistos);
  TObject* obj = 0;
  while ((obj = next())) fRingHistos.Add(obj);
  
  return *this;
}

//____________________________________________________________________
AliFMDSharingFilter::RingHistos*
AliFMDSharingFilter::GetRingHistos(UShort_t d, Char_t r) const
{
  // 
  // Get the ring histogram container 
  // 
  // Parameters:
  //    d Detector
  //    r Ring 
  // 
  // Return:
  //    Ring histogram container 
  //
  Int_t idx = -1;
  switch (d) { 
  case 1: idx = 0; break;
  case 2: idx = 1 + (r == 'I' || r == 'i' ? 0 : 1); break;
  case 3: idx = 3 + (r == 'I' || r == 'i' ? 0 : 1); break;
  }
  if (idx < 0 || idx >= fRingHistos.GetEntries()) return 0;
  
  return static_cast<RingHistos*>(fRingHistos.At(idx));
}

//____________________________________________________________________
Bool_t
AliFMDSharingFilter::Filter(const AliESDFMD& input, 
			    Bool_t           lowFlux,
			    AliESDFMD&       output)
{
  // 
  // Filter the input AliESDFMD object
  // 
  // Parameters:
  //    input     Input 
  //    lowFlux   If this is a low-flux event 
  //    output    Output AliESDFMD object 
  // 
  // Return:
  //    True on success, false otherwise 
  //
  output.Clear();
  TIter    next(&fRingHistos);
  RingHistos* o      = 0;
  Double_t    lowCut = GetLowCut();
  while ((o = static_cast<RingHistos*>(next())))
    o->Clear();

  // AliFMDAnaParameters* pars = AliFMDAnaParameters::Instance();

  for(UShort_t d = 1; d <= 3; d++) {
    Int_t nRings = (d == 1 ? 1 : 2);
    for (UShort_t q = 0; q < nRings; q++) {
      Char_t      r    = (q == 0 ? 'I' : 'O');
      UShort_t    nsec = (q == 0 ?  20 :  40);
      UShort_t    nstr = (q == 0 ? 512 : 256);

      RingHistos* histos = GetRingHistos(d, r);
      
      for(UShort_t s = 0; s < nsec;  s++) {
	Bool_t usedThis = kFALSE;
	Bool_t usedPrev = kFALSE;
	
	for(UShort_t t = 0; t < nstr; t++) {
	  output.SetMultiplicity(d,r,s,t,0.);
	  Float_t mult = SignalInStrip(input,d,r,s,t);
	  
	  // Keep dead-channel information. 
	  if(mult == AliESDFMD::kInvalidMult)
	    output.SetMultiplicity(d,r,s,t,AliESDFMD::kInvalidMult);

	  // If no signal or dead strip, go on. 
	  if (mult == AliESDFMD::kInvalidMult || mult == 0) continue;

	  // Get the pseudo-rapidity 
	  Double_t eta = input.Eta(d,r,s,t);
	  
	  // Fill the diagnostics histogram 
	  histos->fBefore->Fill(mult);

	  // Get next and previous signal - if any 
	  Double_t prevE = 0;
	  Double_t nextE = 0;
	  if (t != 0) {
	    prevE = SignalInStrip(input,d,r,s,t-1);
	    if (prevE == AliESDFMD::kInvalidMult) prevE = 0;
	  }
	  if (t != nstr - 1) {
	    nextE = SignalInStrip(input,d,r,s,t+1);
	    if (nextE == AliESDFMD::kInvalidMult) nextE = 0;
	  }
	  
	  Double_t mergedEnergy = MultiplicityOfStrip(mult,eta,prevE,nextE,
						      lowFlux,d,r,s,t, 
						      usedPrev,usedThis);
	  if (mergedEnergy > lowCut) histos->Incr();
	  histos->fAfter->Fill(mergedEnergy);

	  output.SetMultiplicity(d,r,s,t,mergedEnergy);
	  output.SetEta(d,r,s,t,eta);
	} // for strip
      } // for sector
    } // for ring 
  } // for detector

  next.Reset();
  while ((o = static_cast<RingHistos*>(next())))
    o->Finish();

  return kTRUE;
}

//_____________________________________________________________________
Double_t 
AliFMDSharingFilter::SignalInStrip(const AliESDFMD& input, 
				   UShort_t         d,
				   Char_t           r,
				   UShort_t         s,
				   UShort_t         t) const
{
  // 
  // Get the signal in a strip 
  // 
  // Parameters:
  //    fmd   ESD object
  //    d     Detector
  //    r     Ring 
  //    s     Sector 
  //    t     Strip
  // 
  // Return:
  //    The energy signal 
  //
  Double_t mult = input.Multiplicity(d,r,s,t);
  if (mult == AliESDFMD::kInvalidMult || mult == 0) return mult;

  if (fCorrectAngles && !input.IsAngleCorrected()) 
    mult = AngleCorrect(mult, input.Eta(d,r,s,t));
  else if (!fCorrectAngles && input.IsAngleCorrected()) 
    mult = DeAngleCorrect(mult, input.Eta(d,r,s,t));
  return mult;
}
//_____________________________________________________________________
Double_t 
AliFMDSharingFilter::GetLowCut() const
{
  //
  // Get the low cut.  Normally, the low cut is taken to be the lower
  // value of the fit range used when generating the energy loss fits.
  // However, if fLowCut is set (using SetLowCit) to a value greater
  // than 0, then that value is used.
  //
  if (fLowCut > 0) return fLowCut;
  AliForwardCorrectionManager&  fcm = AliForwardCorrectionManager::Instance();
  AliFMDCorrELossFit* fits = fcm.GetELossFit();
  return fits->GetLowCut();
}
			
//_____________________________________________________________________
Double_t 
AliFMDSharingFilter::GetHighCut(UShort_t d, Char_t r, Double_t eta) const
{
  //
  // Get the high cut.  The high cut is defined as the 
  // most-probably-value peak found from the energy distributions, minus 
  // 2 times the width of the corresponding Landau.
  //
  AliForwardCorrectionManager&  fcm = AliForwardCorrectionManager::Instance();

 
  // Get the high cut.  The high cut is defined as the 
  // most-probably-value peak found from the energy distributions, minus 
  // 2 times the width of the corresponding Landau.
  AliFMDCorrELossFit::ELossFit* fit = fcm.GetELossFit()->FindFit(d,r,eta);
  Double_t delta = 1024;
  Double_t xi    = 1024;
  if (!fit) {
    AliError(Form("No energy loss fit for FMD%d%c at eta=%f", d, r, eta));
  }
  else {
    delta = fit->fDelta;
    xi    = fit->fXi;
  }

  if (delta > 100) {
    AliWarning(Form("FMD%d%c, eta=%f, Delta=%f, xi=%f", d, r, eta, delta, xi));
  }
  Double_t highCut = (delta - fNXi * xi);
  return highCut;
}
	   
//_____________________________________________________________________
Double_t 
AliFMDSharingFilter::MultiplicityOfStrip(Double_t mult,
					 Double_t eta,
					 Double_t prevE,
					 Double_t nextE,
					 Bool_t   lowFlux,
					 UShort_t d,
					 Char_t   r,
					 UShort_t /*s*/,
					 UShort_t /*t*/,
					 Bool_t&  usedPrev, 
					 Bool_t&  usedThis) 
{
  // 
  // The actual algorithm 
  // 
  // Parameters:
  //    mult      The unfiltered signal in the strip
  //    eta       Psuedo rapidity 
  //    prevE     Previous strip signal (or 0)
  //    nextE     Next strip signal (or 0) 
  //    lowFlux   Whether this is a low flux event 
  //    d         Detector
  //    r         Ring 
  //    s         Sector 
  //    t         Strip
  //    usedPrev  Whether the previous strip was used in sharing or not
  //    usedThis  Wether this strip was used in sharing or not. 
  // 
  // Return:
  //    The filtered signal in the strip
  //

  // IF the multiplicity is very large, or below the cut, reject it, and 
  // flag it as candidate for sharing 
  Double_t    lowCut = GetLowCut();
  if(mult > 12 || mult < lowCut) {
    usedThis      = kFALSE;
    usedPrev      = kFALSE;
    return 0;
  }

  // If this was shared with the previous signal, return 0 and mark it as 
  // not a candiate for sharing 
  if(usedThis) {
    usedThis      = kFALSE;
    usedPrev      = kTRUE;
    return 0.;
  }

  //analyse and perform sharing on one strip
  
  // Get the high cut 
  Double_t highCut = GetHighCut(d, r, eta);

  // If this signal is smaller than the next, and the next signal is smaller 
  // than then the high cut, and it's a low-flux event, then mark this and 
  // the next signal as candidates for sharing 
  // 
  // This is the test if the signal is the smaller of two possibly
  // shared signals.   
  if (mult  < nextE   && 
      nextE > highCut && 
      lowFlux) {
    usedThis      = kFALSE;
    usedPrev      = kFALSE;
    return 0;
  }
  
  Double_t totalE  = mult;
  
  // If the previous signal was larger than the low cut, and 
  // the previous was smaller than high cut, and the previous signal 
  // isn't marked as used, then add it's energy to this signal 
  if (prevE > lowCut && 
      prevE < highCut && 
      !usedPrev) 
    totalE += prevE;

  // If the next signal is larger than the low cut, and 
  // the next signal is smaller than the low cut, then add the next signal 
  // to this, and marked the next signal as used 
  if(nextE > lowCut && nextE < highCut ) {
    totalE      += nextE;
    usedThis =  kTRUE;
  }

  // If we're processing on non-angle corrected data, we should do the 
  // angle correction here 
  if (!fCorrectAngles) 
    totalE = AngleCorrect(totalE, eta);

  // Fill post processing histogram
  // if(totalE > fLowCut)
  //   GetRingHistos(d,r)->fAfter->Fill(totalE);

  // Return value 
  Double_t mergedEnergy = 0;
  
  if(totalE > 0) {
    // If we have a signal, then this is used (sharedPrev=true) and
    // the signal is set to the result
    mergedEnergy = totalE;
    usedPrev     = kTRUE;
  }
  else {
    // If we do not have a signal (too low), then this is not shared, 
    // and the next strip is not shared either 
    usedThis  = kFALSE;
    usedPrev  = kFALSE;
  }
  
  return mergedEnergy; 
}
//____________________________________________________________________
Double_t
AliFMDSharingFilter::AngleCorrect(Double_t mult, Double_t eta) const
{
  // 
  // Angle correct the signal 
  // 
  // Parameters:
  //    mult Angle Un-corrected Signal 
  //    eta  Pseudo-rapidity 
  // 
  // Return:
  //    Angle corrected signal 
  //
  Double_t theta =  2 * TMath::ATan(TMath::Exp(-eta));
  if (eta < 0) theta -= TMath::Pi();
  return mult * TMath::Cos(theta);
}
//____________________________________________________________________
Double_t
AliFMDSharingFilter::DeAngleCorrect(Double_t mult, Double_t eta) const
{
  // 
  // Angle de-correct the signal 
  // 
  // Parameters:
  //    mult Angle corrected Signal 
  //    eta  Pseudo-rapidity 
  // 
  // Return:
  //    Angle un-corrected signal 
  //
  Double_t theta =  2 * TMath::ATan(TMath::Exp(-eta));
  if (eta < 0) theta -= TMath::Pi();
  return mult / TMath::Cos(theta);
}

//____________________________________________________________________
void
AliFMDSharingFilter::ScaleHistograms(TList* dir, Int_t nEvents)
{
  // 
  // Scale the histograms to the total number of events 
  // 
  // Parameters:
  //    dir     Where the output is 
  //    nEvents Number of events 
  //
  if (nEvents <= 0) return;
  TList* d = static_cast<TList*>(dir->FindObject(GetName()));
  if (!d) return;

  TIter    next(&fRingHistos);
  RingHistos* o = 0;
  while ((o = static_cast<RingHistos*>(next())))
    o->ScaleHistograms(d, nEvents);
}

//____________________________________________________________________
void
AliFMDSharingFilter::DefineOutput(TList* dir)
{
  // 
  // Define the output histograms.  These are put in a sub list of the
  // passed list.   The histograms are merged before the parent task calls 
  // AliAnalysisTaskSE::Terminate 
  // 
  // Parameters:
  //    dir Directory to add to 
  //
  TList* d = new TList;
  d->SetName(GetName());
  dir->Add(d);
  TIter    next(&fRingHistos);
  RingHistos* o = 0;
  while ((o = static_cast<RingHistos*>(next()))) {
    o->Output(d);
  }
}
//____________________________________________________________________
void
AliFMDSharingFilter::Print(Option_t* /*option*/) const
{
  // 
  // Print information
  // 
  // Parameters:
  //    option Not used 
  //
  char ind[gROOT->GetDirLevel()+1];
  for (Int_t i = 0; i < gROOT->GetDirLevel(); i++) ind[i] = ' ';
  ind[gROOT->GetDirLevel()] = '\0';
  std::cout << ind << "AliFMDSharingFilter: " << GetName() << '\n'
	    << ind << " Low cut:                " << fLowCut << '\n'
	    << ind << " N xi factor:            " << fNXi    << '\n'
	    << ind << " Use corrected angles:   " 
	    << (fCorrectAngles ? "yes" : "no") << std::endl;
}
  
//====================================================================
AliFMDSharingFilter::RingHistos::RingHistos()
  : AliForwardUtil::RingHistos(), 
    fBefore(0), 
    fAfter(0), 
    fHits(0),
    fNHits(0)
{
  // 
  // Default CTOR
  //

}

//____________________________________________________________________
AliFMDSharingFilter::RingHistos::RingHistos(UShort_t d, Char_t r)
  : AliForwardUtil::RingHistos(d,r), 
    fBefore(0), 
    fAfter(0),
    fHits(0),
    fNHits(0)
{
  // 
  // Constructor
  // 
  // Parameters:
  //    d detector
  //    r ring 
  //
  fBefore = new TH1D(Form("%s_ESD_Eloss", fName.Data()), 
		     Form("Energy loss in %s (reconstruction)", fName.Data()), 
		     1000, 0, 25);
  fAfter  = new TH1D(Form("%s_Ana_Eloss", fName.Data()), 
		     Form("Energy loss in %s (sharing corrected)",
			  fName.Data()), 1000, 0, 25);
  fBefore->SetXTitle("#Delta E/#Delta E_{mip}");
  fBefore->SetYTitle("P(#Delta E/#Delta E_{mip})");
  fBefore->SetFillColor(kRed+1);
  fBefore->SetFillStyle(3001);
  // fBefore->Sumw2();
  fBefore->SetDirectory(0);
  fAfter->SetXTitle("#Delta E/#Delta E_{mip}");
  fAfter->SetYTitle("P(#Delta E/#Delta E_{mip})");
  fAfter->SetFillColor(kBlue+1);
  fAfter->SetFillStyle(3001);
  // fAfter->Sumw2();
  fAfter->SetDirectory(0);

  fHits = new TH1D(Form("%s_Hits", fName.Data()), 
		   Form("Number of hits in %s", fName.Data()), 
		   200, 0, 200000);
  fHits->SetDirectory(0);
  fHits->SetXTitle("# of hits");
  fHits->SetFillColor(kGreen+1);
}
//____________________________________________________________________
AliFMDSharingFilter::RingHistos::RingHistos(const RingHistos& o)
  : AliForwardUtil::RingHistos(o), 
    fBefore(o.fBefore), 
    fAfter(o.fAfter),
    fHits(o.fHits),
    fNHits(o.fNHits)
{
  // 
  // Copy constructor 
  // 
  // Parameters:
  //    o Object to copy from 
  //
}

//____________________________________________________________________
AliFMDSharingFilter::RingHistos&
AliFMDSharingFilter::RingHistos::operator=(const RingHistos& o)
{
  // 
  // Assignment operator 
  // 
  // Parameters:
  //    o Object to assign from 
  // 
  // Return:
  //    Reference to this 
  //
  AliForwardUtil::RingHistos::operator=(o);
  fDet = o.fDet;
  fRing = o.fRing;
  
  if (fBefore) delete  fBefore;
  if (fAfter)  delete  fAfter;
  if (fHits)   delete fHits;
  
  fBefore = static_cast<TH1D*>(o.fBefore->Clone());
  fAfter  = static_cast<TH1D*>(o.fAfter->Clone());
  fHits  = static_cast<TH1D*>(o.fHits->Clone());
  
  return *this;
}
//____________________________________________________________________
AliFMDSharingFilter::RingHistos::~RingHistos()
{
  // 
  // Destructor 
  //
  if (fBefore) delete fBefore;
  if (fAfter)  delete fAfter;
  if (fHits)   delete fHits;
}
//____________________________________________________________________
void
AliFMDSharingFilter::RingHistos::Finish()
{
  // 
  // Finish off 
  // 
  //
  fHits->Fill(fNHits);
}

//____________________________________________________________________
void
AliFMDSharingFilter::RingHistos::ScaleHistograms(TList* dir, Int_t nEvents)
{
  // 
  // Scale the histograms to the total number of events 
  // 
  // Parameters:
  //    nEvents Number of events 
  //    dir     Where the output is 
  //
  TList* l = GetOutputList(dir);
  if (!l) return; 

  TH1D* before = static_cast<TH1D*>(l->FindObject(Form("%s_ESD_ELoss",
						       fName.Data())));
  TH1D* after  = static_cast<TH1D*>(l->FindObject(Form("%s_Ana_ELoss",
						       fName.Data())));
  if (before) before->Scale(1./nEvents);
  if (after)  after->Scale(1./nEvents);
}

//____________________________________________________________________
void
AliFMDSharingFilter::RingHistos::Output(TList* dir)
{
  // 
  // Make output 
  // 
  // Parameters:
  //    dir where to store 
  //
  TList* d = DefineOutputList(dir);
  d->Add(fBefore);
  d->Add(fAfter);
  d->Add(fHits);
  dir->Add(d);
}

//____________________________________________________________________
//
// EOF
//
Commit	Line	Data
7e4038b5	1	//
7984e5f7	2	// Class to do the sharing correction. That is, a filter that merges
	3	// adjacent strip signals presumably originating from a single particle
	4	// that impinges on the detector in such a way that it deposite energy
	5	// into two or more strips.
	6	//
	7	// Input:
	8	// - AliESDFMD object - from reconstruction
	9	//
	10	// Output:
	11	// - AliESDFMD object - copy of input, but with signals merged
	12	//
	13	// Corrections used:
	14	// - AliFMDCorrELossFit
	15	//
	16	// Histograms:
	17	// - For each ring (FMD1i, FMD2i, FMD2o, FMD3i, FMD3o) the distribution of
	18	// signals before and after the filter.
	19	// - For each ring (see above), an array of distributions of number of
	20	// hit strips for each vertex bin (if enabled - see Init method)
	21	//
	22	//
7e4038b5	23	//
	24	#include "AliFMDSharingFilter.h"
	25	#include <AliESDFMD.h>
	26	#include <TAxis.h>
	27	#include <TList.h>
	28	#include <TH1.h>
	29	#include <TMath.h>
0bd4b00f	30	#include "AliForwardCorrectionManager.h"
7e4038b5	31	#include <AliLog.h>
0bd4b00f	32	#include <TROOT.h>
	33	#include <iostream>
	34	#include <iomanip>
7e4038b5	35
	36	ClassImp(AliFMDSharingFilter)
	37	#if 0
	38	; // This is for Emacs
	39	#endif
	40
	41
	42	//____________________________________________________________________
	43	AliFMDSharingFilter::AliFMDSharingFilter()
	44	: TNamed(),
	45	fRingHistos(),
0bd4b00f	46	fLowCut(0.),
ea3e5d95	47	fCorrectAngles(kFALSE),
0bd4b00f	48	fNXi(1),
ea3e5d95	49	fDebug(0)
7984e5f7	50	{
	51	//
	52	// Default Constructor - do not use
	53	//
	54	}
7e4038b5	55
	56	//____________________________________________________________________
	57	AliFMDSharingFilter::AliFMDSharingFilter(const char* title)
	58	: TNamed("fmdSharingFilter", title),
	59	fRingHistos(),
0bd4b00f	60	fLowCut(0.),
ea3e5d95	61	fCorrectAngles(kFALSE),
0bd4b00f	62	fNXi(1),
ea3e5d95	63	fDebug(0)
7e4038b5	64	{
7984e5f7	65	//
	66	// Constructor
	67	//
	68	// Parameters:
	69	// title Title of object - not significant
	70	//
7e4038b5	71	fRingHistos.Add(new RingHistos(1, 'I'));
	72	fRingHistos.Add(new RingHistos(2, 'I'));
	73	fRingHistos.Add(new RingHistos(2, 'O'));
	74	fRingHistos.Add(new RingHistos(3, 'I'));
	75	fRingHistos.Add(new RingHistos(3, 'O'));
7e4038b5	76	}
	77
	78	//____________________________________________________________________
	79	AliFMDSharingFilter::AliFMDSharingFilter(const AliFMDSharingFilter& o)
	80	: TNamed(o),
	81	fRingHistos(),
	82	fLowCut(o.fLowCut),
ea3e5d95	83	fCorrectAngles(o.fCorrectAngles),
0bd4b00f	84	fNXi(o.fNXi),
ea3e5d95	85	fDebug(o.fDebug)
7e4038b5	86	{
7984e5f7	87	//
	88	// Copy constructor
	89	//
	90	// Parameters:
	91	// o Object to copy from
	92	//
7e4038b5	93	TIter next(&o.fRingHistos);
	94	TObject* obj = 0;
	95	while ((obj = next())) fRingHistos.Add(obj);
	96	}
	97
	98	//____________________________________________________________________
	99	AliFMDSharingFilter::~AliFMDSharingFilter()
	100	{
7984e5f7	101	//
	102	// Destructor
	103	//
7e4038b5	104	fRingHistos.Delete();
	105	}
	106
	107	//____________________________________________________________________
	108	AliFMDSharingFilter&
	109	AliFMDSharingFilter::operator=(const AliFMDSharingFilter& o)
	110	{
7984e5f7	111	//
	112	// Assignment operator
	113	//
	114	// Parameters:
	115	// o Object to assign from
	116	//
	117	// Return:
	118	// Reference to this
	119	//
ea3e5d95	120	TNamed::operator=(o);
7e4038b5	121
	122	fLowCut = o.fLowCut;
	123	fCorrectAngles = o.fCorrectAngles;
0bd4b00f	124	fNXi = o.fNXi;
ea3e5d95	125	fDebug = o.fDebug;
7e4038b5	126
	127	fRingHistos.Delete();
	128	TIter next(&o.fRingHistos);
	129	TObject* obj = 0;
	130	while ((obj = next())) fRingHistos.Add(obj);
	131
	132	return *this;
	133	}
	134
	135	//____________________________________________________________________
	136	AliFMDSharingFilter::RingHistos*
	137	AliFMDSharingFilter::GetRingHistos(UShort_t d, Char_t r) const
	138	{
7984e5f7	139	//
	140	// Get the ring histogram container
	141	//
	142	// Parameters:
	143	// d Detector
	144	// r Ring
	145	//
	146	// Return:
	147	// Ring histogram container
	148	//
7e4038b5	149	Int_t idx = -1;
	150	switch (d) {
	151	case 1: idx = 0; break;
	152	case 2: idx = 1 + (r == 'I' \|\| r == 'i' ? 0 : 1); break;
	153	case 3: idx = 3 + (r == 'I' \|\| r == 'i' ? 0 : 1); break;
	154	}
	155	if (idx < 0 \|\| idx >= fRingHistos.GetEntries()) return 0;
	156
	157	return static_cast<RingHistos*>(fRingHistos.At(idx));
	158	}
	159
	160	//____________________________________________________________________
	161	Bool_t
	162	AliFMDSharingFilter::Filter(const AliESDFMD& input,
	163	Bool_t lowFlux,
ea3e5d95	164	AliESDFMD& output)
7e4038b5	165	{
7984e5f7	166	//
	167	// Filter the input AliESDFMD object
	168	//
	169	// Parameters:
	170	// input Input
	171	// lowFlux If this is a low-flux event
	172	// output Output AliESDFMD object
	173	//
	174	// Return:
	175	// True on success, false otherwise
	176	//
7e4038b5	177	output.Clear();
7e4038b5	178	TIter next(&fRingHistos);
0bd4b00f	179	RingHistos* o = 0;
0bd4b00f	180	Double_t lowCut = GetLowCut();
7e4038b5	181	while ((o = static_cast<RingHistos*>(next())))
	182	o->Clear();
	183
ea3e5d95	184	// AliFMDAnaParameters* pars = AliFMDAnaParameters::Instance();
7e4038b5	185
	186	for(UShort_t d = 1; d <= 3; d++) {
	187	Int_t nRings = (d == 1 ? 1 : 2);
	188	for (UShort_t q = 0; q < nRings; q++) {
	189	Char_t r = (q == 0 ? 'I' : 'O');
	190	UShort_t nsec = (q == 0 ? 20 : 40);
	191	UShort_t nstr = (q == 0 ? 512 : 256);
	192
	193	RingHistos* histos = GetRingHistos(d, r);
	194
	195	for(UShort_t s = 0; s < nsec; s++) {
	196	Bool_t usedThis = kFALSE;
	197	Bool_t usedPrev = kFALSE;
	198
	199	for(UShort_t t = 0; t < nstr; t++) {
	200	output.SetMultiplicity(d,r,s,t,0.);
	201	Float_t mult = SignalInStrip(input,d,r,s,t);
	202
	203	// Keep dead-channel information.
	204	if(mult == AliESDFMD::kInvalidMult)
	205	output.SetMultiplicity(d,r,s,t,AliESDFMD::kInvalidMult);
	206
	207	// If no signal or dead strip, go on.
	208	if (mult == AliESDFMD::kInvalidMult \|\| mult == 0) continue;
	209
	210	// Get the pseudo-rapidity
ea3e5d95	211	Double_t eta = input.Eta(d,r,s,t);
7e4038b5	212
	213	// Fill the diagnostics histogram
	214	histos->fBefore->Fill(mult);
	215
	216	// Get next and previous signal - if any
	217	Double_t prevE = 0;
	218	Double_t nextE = 0;
	219	if (t != 0) {
	220	prevE = SignalInStrip(input,d,r,s,t-1);
	221	if (prevE == AliESDFMD::kInvalidMult) prevE = 0;
	222	}
	223	if (t != nstr - 1) {
	224	nextE = SignalInStrip(input,d,r,s,t+1);
	225	if (nextE == AliESDFMD::kInvalidMult) nextE = 0;
	226	}
	227
	228	Double_t mergedEnergy = MultiplicityOfStrip(mult,eta,prevE,nextE,
	229	lowFlux,d,r,s,t,
	230	usedPrev,usedThis);
0bd4b00f	231	if (mergedEnergy > lowCut) histos->Incr();
7e4038b5	232	histos->fAfter->Fill(mergedEnergy);
	233
	234	output.SetMultiplicity(d,r,s,t,mergedEnergy);
	235	output.SetEta(d,r,s,t,eta);
	236	} // for strip
	237	} // for sector
	238	} // for ring
	239	} // for detector
	240
	241	next.Reset();
	242	while ((o = static_cast<RingHistos*>(next())))
	243	o->Finish();
	244
	245	return kTRUE;
	246	}
	247
	248	//_____________________________________________________________________
	249	Double_t
	250	AliFMDSharingFilter::SignalInStrip(const AliESDFMD& input,
	251	UShort_t d,
	252	Char_t r,
	253	UShort_t s,
	254	UShort_t t) const
	255	{
7984e5f7	256	//
	257	// Get the signal in a strip
	258	//
	259	// Parameters:
	260	// fmd ESD object
	261	// d Detector
	262	// r Ring
	263	// s Sector
	264	// t Strip
	265	//
	266	// Return:
	267	// The energy signal
	268	//
7e4038b5	269	Double_t mult = input.Multiplicity(d,r,s,t);
	270	if (mult == AliESDFMD::kInvalidMult \|\| mult == 0) return mult;
	271
	272	if (fCorrectAngles && !input.IsAngleCorrected())
	273	mult = AngleCorrect(mult, input.Eta(d,r,s,t));
	274	else if (!fCorrectAngles && input.IsAngleCorrected())
	275	mult = DeAngleCorrect(mult, input.Eta(d,r,s,t));
	276	return mult;
	277	}
0bd4b00f	278	//_____________________________________________________________________
	279	Double_t
	280	AliFMDSharingFilter::GetLowCut() const
	281	{
7984e5f7	282	//
	283	// Get the low cut. Normally, the low cut is taken to be the lower
	284	// value of the fit range used when generating the energy loss fits.
	285	// However, if fLowCut is set (using SetLowCit) to a value greater
	286	// than 0, then that value is used.
	287	//
0bd4b00f	288	if (fLowCut > 0) return fLowCut;
	289	AliForwardCorrectionManager& fcm = AliForwardCorrectionManager::Instance();
	290	AliFMDCorrELossFit* fits = fcm.GetELossFit();
	291	return fits->GetLowCut();
	292	}
7e4038b5	293
	294	//_____________________________________________________________________
	295	Double_t
	296	AliFMDSharingFilter::GetHighCut(UShort_t d, Char_t r, Double_t eta) const
	297	{
7984e5f7	298	//
	299	// Get the high cut. The high cut is defined as the
	300	// most-probably-value peak found from the energy distributions, minus
	301	// 2 times the width of the corresponding Landau.
	302	//
0bd4b00f	303	AliForwardCorrectionManager& fcm = AliForwardCorrectionManager::Instance();
0bd4b00f	304
7e4038b5	305
	306	// Get the high cut. The high cut is defined as the
	307	// most-probably-value peak found from the energy distributions, minus
	308	// 2 times the width of the corresponding Landau.
0bd4b00f	309	AliFMDCorrELossFit::ELossFit* fit = fcm.GetELossFit()->FindFit(d,r,eta);
	310	Double_t delta = 1024;
	311	Double_t xi = 1024;
	312	if (!fit) {
	313	AliError(Form("No energy loss fit for FMD%d%c at eta=%f", d, r, eta));
	314	}
	315	else {
	316	delta = fit->fDelta;
	317	xi = fit->fXi;
	318	}
	319
	320	if (delta > 100) {
	321	AliWarning(Form("FMD%d%c, eta=%f, Delta=%f, xi=%f", d, r, eta, delta, xi));
	322	}
	323	Double_t highCut = (delta - fNXi * xi);
7e4038b5	324	return highCut;
	325	}
	326
	327	//_____________________________________________________________________
	328	Double_t
	329	AliFMDSharingFilter::MultiplicityOfStrip(Double_t mult,
	330	Double_t eta,
	331	Double_t prevE,
	332	Double_t nextE,
	333	Bool_t lowFlux,
	334	UShort_t d,
	335	Char_t r,
	336	UShort_t /s/,
	337	UShort_t /t/,
	338	Bool_t& usedPrev,
	339	Bool_t& usedThis)
	340	{
7984e5f7	341	//
	342	// The actual algorithm
	343	//
	344	// Parameters:
	345	// mult The unfiltered signal in the strip
	346	// eta Psuedo rapidity
	347	// prevE Previous strip signal (or 0)
	348	// nextE Next strip signal (or 0)
	349	// lowFlux Whether this is a low flux event
	350	// d Detector
	351	// r Ring
	352	// s Sector
	353	// t Strip
	354	// usedPrev Whether the previous strip was used in sharing or not
	355	// usedThis Wether this strip was used in sharing or not.
	356	//
	357	// Return:
	358	// The filtered signal in the strip
	359	//
	360
7e4038b5	361	// IF the multiplicity is very large, or below the cut, reject it, and
7e4038b5	362	// flag it as candidate for sharing
0bd4b00f	363	Double_t lowCut = GetLowCut();
0bd4b00f	364	if(mult > 12 \|\| mult < lowCut) {
7e4038b5	365	usedThis = kFALSE;
	366	usedPrev = kFALSE;
	367	return 0;
	368	}
	369
	370	// If this was shared with the previous signal, return 0 and mark it as
	371	// not a candiate for sharing
	372	if(usedThis) {
	373	usedThis = kFALSE;
	374	usedPrev = kTRUE;
	375	return 0.;
	376	}
	377
	378	//analyse and perform sharing on one strip
	379
0bd4b00f	380	// Get the high cut
7e4038b5	381	Double_t highCut = GetHighCut(d, r, eta);
	382
	383	// If this signal is smaller than the next, and the next signal is smaller
	384	// than then the high cut, and it's a low-flux event, then mark this and
	385	// the next signal as candidates for sharing
	386	//
	387	// This is the test if the signal is the smaller of two possibly
	388	// shared signals.
	389	if (mult < nextE &&
	390	nextE > highCut &&
	391	lowFlux) {
	392	usedThis = kFALSE;
	393	usedPrev = kFALSE;
	394	return 0;
	395	}
	396
	397	Double_t totalE = mult;
	398
	399	// If the previous signal was larger than the low cut, and
	400	// the previous was smaller than high cut, and the previous signal
	401	// isn't marked as used, then add it's energy to this signal
0bd4b00f	402	if (prevE > lowCut &&
7e4038b5	403	prevE < highCut &&
	404	!usedPrev)
	405	totalE += prevE;
	406
	407	// If the next signal is larger than the low cut, and
	408	// the next signal is smaller than the low cut, then add the next signal
	409	// to this, and marked the next signal as used
0bd4b00f	410	if(nextE > lowCut && nextE < highCut ) {
7e4038b5	411	totalE += nextE;
	412	usedThis = kTRUE;
	413	}
	414
	415	// If we're processing on non-angle corrected data, we should do the
	416	// angle correction here
	417	if (!fCorrectAngles)
	418	totalE = AngleCorrect(totalE, eta);
	419
	420	// Fill post processing histogram
	421	// if(totalE > fLowCut)
	422	// GetRingHistos(d,r)->fAfter->Fill(totalE);
	423
	424	// Return value
	425	Double_t mergedEnergy = 0;
	426
	427	if(totalE > 0) {
	428	// If we have a signal, then this is used (sharedPrev=true) and
	429	// the signal is set to the result
	430	mergedEnergy = totalE;
	431	usedPrev = kTRUE;
	432	}
	433	else {
	434	// If we do not have a signal (too low), then this is not shared,
	435	// and the next strip is not shared either
	436	usedThis = kFALSE;
	437	usedPrev = kFALSE;
	438	}
	439
	440	return mergedEnergy;
	441	}
	442	//____________________________________________________________________
	443	Double_t
	444	AliFMDSharingFilter::AngleCorrect(Double_t mult, Double_t eta) const
	445	{
7984e5f7	446	//
	447	// Angle correct the signal
	448	//
	449	// Parameters:
	450	// mult Angle Un-corrected Signal
	451	// eta Pseudo-rapidity
	452	//
	453	// Return:
	454	// Angle corrected signal
	455	//
7e4038b5	456	Double_t theta = 2 * TMath::ATan(TMath::Exp(-eta));
	457	if (eta < 0) theta -= TMath::Pi();
	458	return mult * TMath::Cos(theta);
	459	}
	460	//____________________________________________________________________
	461	Double_t
	462	AliFMDSharingFilter::DeAngleCorrect(Double_t mult, Double_t eta) const
	463	{
7984e5f7	464	//
	465	// Angle de-correct the signal
	466	//
	467	// Parameters:
	468	// mult Angle corrected Signal
	469	// eta Pseudo-rapidity
	470	//
	471	// Return:
	472	// Angle un-corrected signal
	473	//
7e4038b5	474	Double_t theta = 2 * TMath::ATan(TMath::Exp(-eta));
	475	if (eta < 0) theta -= TMath::Pi();
	476	return mult / TMath::Cos(theta);
	477	}
	478
	479	//____________________________________________________________________
	480	void
9d99b0dd	481	AliFMDSharingFilter::ScaleHistograms(TList* dir, Int_t nEvents)
7e4038b5	482	{
7984e5f7	483	//
	484	// Scale the histograms to the total number of events
	485	//
	486	// Parameters:
	487	// dir Where the output is
	488	// nEvents Number of events
	489	//
7e4038b5	490	if (nEvents <= 0) return;
9d99b0dd	491	TList* d = static_cast<TList*>(dir->FindObject(GetName()));
9d99b0dd	492	if (!d) return;
7e4038b5	493
	494	TIter next(&fRingHistos);
	495	RingHistos* o = 0;
9d99b0dd	496	while ((o = static_cast<RingHistos*>(next())))
9d99b0dd	497	o->ScaleHistograms(d, nEvents);
7e4038b5	498	}
	499
	500	//____________________________________________________________________
	501	void
9d99b0dd	502	AliFMDSharingFilter::DefineOutput(TList* dir)
7e4038b5	503	{
7984e5f7	504	//
	505	// Define the output histograms. These are put in a sub list of the
	506	// passed list. The histograms are merged before the parent task calls
	507	// AliAnalysisTaskSE::Terminate
	508	//
	509	// Parameters:
	510	// dir Directory to add to
	511	//
7e4038b5	512	TList* d = new TList;
	513	d->SetName(GetName());
	514	dir->Add(d);
7e4038b5	515	TIter next(&fRingHistos);
	516	RingHistos* o = 0;
	517	while ((o = static_cast<RingHistos*>(next()))) {
	518	o->Output(d);
	519	}
	520	}
0bd4b00f	521	//____________________________________________________________________
	522	void
	523	AliFMDSharingFilter::Print(Option_t* /option/) const
	524	{
7984e5f7	525	//
	526	// Print information
	527	//
	528	// Parameters:
	529	// option Not used
	530	//
0bd4b00f	531	char ind[gROOT->GetDirLevel()+1];
	532	for (Int_t i = 0; i < gROOT->GetDirLevel(); i++) ind[i] = ' ';
	533	ind[gROOT->GetDirLevel()] = '\0';
	534	std::cout << ind << "AliFMDSharingFilter: " << GetName() << '\n'
	535	<< ind << " Low cut: " << fLowCut << '\n'
	536	<< ind << " N xi factor: " << fNXi << '\n'
	537	<< ind << " Use corrected angles: "
	538	<< (fCorrectAngles ? "yes" : "no") << std::endl;
	539	}
7e4038b5	540
	541	//====================================================================
	542	AliFMDSharingFilter::RingHistos::RingHistos()
9d99b0dd	543	: AliForwardUtil::RingHistos(),
7e4038b5	544	fBefore(0),
	545	fAfter(0),
	546	fHits(0),
	547	fNHits(0)
7984e5f7	548	{
	549	//
	550	// Default CTOR
	551	//
	552
	553	}
7e4038b5	554
	555	//____________________________________________________________________
	556	AliFMDSharingFilter::RingHistos::RingHistos(UShort_t d, Char_t r)
9d99b0dd	557	: AliForwardUtil::RingHistos(d,r),
7e4038b5	558	fBefore(0),
	559	fAfter(0),
	560	fHits(0),
	561	fNHits(0)
	562	{
7984e5f7	563	//
	564	// Constructor
	565	//
	566	// Parameters:
	567	// d detector
	568	// r ring
	569	//
9d99b0dd	570	fBefore = new TH1D(Form("%s_ESD_Eloss", fName.Data()),
9d99b0dd	571	Form("Energy loss in %s (reconstruction)", fName.Data()),
7e4038b5	572	1000, 0, 25);
9d99b0dd	573	fAfter = new TH1D(Form("%s_Ana_Eloss", fName.Data()),
	574	Form("Energy loss in %s (sharing corrected)",
	575	fName.Data()), 1000, 0, 25);
7e4038b5	576	fBefore->SetXTitle("#Delta E/#Delta E_{mip}");
	577	fBefore->SetYTitle("P(#Delta E/#Delta E_{mip})");
	578	fBefore->SetFillColor(kRed+1);
	579	fBefore->SetFillStyle(3001);
	580	// fBefore->Sumw2();
	581	fBefore->SetDirectory(0);
	582	fAfter->SetXTitle("#Delta E/#Delta E_{mip}");
	583	fAfter->SetYTitle("P(#Delta E/#Delta E_{mip})");
	584	fAfter->SetFillColor(kBlue+1);
	585	fAfter->SetFillStyle(3001);
	586	// fAfter->Sumw2();
	587	fAfter->SetDirectory(0);
	588
9d99b0dd	589	fHits = new TH1D(Form("%s_Hits", fName.Data()),
9d99b0dd	590	Form("Number of hits in %s", fName.Data()),
7e4038b5	591	200, 0, 200000);
	592	fHits->SetDirectory(0);
	593	fHits->SetXTitle("# of hits");
	594	fHits->SetFillColor(kGreen+1);
	595	}
	596	//____________________________________________________________________
	597	AliFMDSharingFilter::RingHistos::RingHistos(const RingHistos& o)
9d99b0dd	598	: AliForwardUtil::RingHistos(o),
7e4038b5	599	fBefore(o.fBefore),
	600	fAfter(o.fAfter),
	601	fHits(o.fHits),
	602	fNHits(o.fNHits)
7984e5f7	603	{
	604	//
	605	// Copy constructor
	606	//
	607	// Parameters:
	608	// o Object to copy from
	609	//
	610	}
7e4038b5	611
	612	//____________________________________________________________________
	613	AliFMDSharingFilter::RingHistos&
	614	AliFMDSharingFilter::RingHistos::operator=(const RingHistos& o)
	615	{
7984e5f7	616	//
	617	// Assignment operator
	618	//
	619	// Parameters:
	620	// o Object to assign from
	621	//
	622	// Return:
	623	// Reference to this
	624	//
9d99b0dd	625	AliForwardUtil::RingHistos::operator=(o);
7e4038b5	626	fDet = o.fDet;
	627	fRing = o.fRing;
	628
	629	if (fBefore) delete fBefore;
	630	if (fAfter) delete fAfter;
	631	if (fHits) delete fHits;
	632
	633	fBefore = static_cast<TH1D*>(o.fBefore->Clone());
	634	fAfter = static_cast<TH1D*>(o.fAfter->Clone());
	635	fHits = static_cast<TH1D*>(o.fHits->Clone());
	636
	637	return *this;
	638	}
	639	//____________________________________________________________________
	640	AliFMDSharingFilter::RingHistos::~RingHistos()
	641	{
7984e5f7	642	//
	643	// Destructor
	644	//
7e4038b5	645	if (fBefore) delete fBefore;
	646	if (fAfter) delete fAfter;
	647	if (fHits) delete fHits;
	648	}
	649	//____________________________________________________________________
	650	void
	651	AliFMDSharingFilter::RingHistos::Finish()
	652	{
7984e5f7	653	//
	654	// Finish off
	655	//
	656	//
7e4038b5	657	fHits->Fill(fNHits);
	658	}
	659
9d99b0dd	660	//____________________________________________________________________
	661	void
	662	AliFMDSharingFilter::RingHistos::ScaleHistograms(TList* dir, Int_t nEvents)
	663	{
7984e5f7	664	//
	665	// Scale the histograms to the total number of events
	666	//
	667	// Parameters:
	668	// nEvents Number of events
	669	// dir Where the output is
	670	//
9d99b0dd	671	TList* l = GetOutputList(dir);
	672	if (!l) return;
	673
	674	TH1D* before = static_cast<TH1D*>(l->FindObject(Form("%s_ESD_ELoss",
	675	fName.Data())));
	676	TH1D* after = static_cast<TH1D*>(l->FindObject(Form("%s_Ana_ELoss",
	677	fName.Data())));
	678	if (before) before->Scale(1./nEvents);
	679	if (after) after->Scale(1./nEvents);
	680	}
	681
7e4038b5	682	//____________________________________________________________________
	683	void
	684	AliFMDSharingFilter::RingHistos::Output(TList* dir)
	685	{
7984e5f7	686	//
	687	// Make output
	688	//
	689	// Parameters:
	690	// dir where to store
	691	//
9d99b0dd	692	TList* d = DefineOutputList(dir);
7e4038b5	693	d->Add(fBefore);
	694	d->Add(fAfter);
	695	d->Add(fHits);
	696	dir->Add(d);
	697	}
	698
	699	//____________________________________________________________________
	700	//
	701	// EOF
	702	//