HybridClusterAlgo.cc

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#include "RecoEcal/EgammaClusterAlgos/interface/HybridClusterAlgo.h"
#include "RecoCaloTools/Navigation/interface/EcalBarrelNavigator.h"
#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "Geometry/CaloGeometry/interface/CaloCellGeometry.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "RecoEcal/EgammaCoreTools/interface/ClusterEtLess.h"
#include "RecoLocalCalo/EcalRecAlgos/interface/EcalSeverityLevelAlgo.h"
 
#include <iostream>
#include <map>
#include <vector>
#include <set>
 
//The real constructor
HybridClusterAlgo::HybridClusterAlgo(double eb_str,
                                     int step,
                                     double ethres,
                                     double eseed,
                                     double xi,
                                     bool useEtForXi,
                                     double ewing,
                                     const std::vector<int>& v_chstatus,
                                     const PositionCalc& posCalculator,
                                     bool dynamicEThres,
                                     double eThresA,
                                     double eThresB,
                                     const std::vector<int>& severityToExclude,
                                     bool excludeFromCluster)
    :
 
      eb_st(eb_str),
      phiSteps_(step),
      eThres_(ethres),
      eThresA_(eThresA),
      eThresB_(eThresB),
      Eseed(eseed),
      Xi(xi),
      UseEtForXi(useEtForXi),
      Ewing(ewing),
      dynamicEThres_(dynamicEThres),
      v_chstatus_(v_chstatus),
      v_severitylevel_(severityToExclude),
      //severityRecHitThreshold_(severityRecHitThreshold),
      //severitySpikeThreshold_(severitySpikeThreshold),
      excludeFromCluster_(excludeFromCluster)
 
{
  dynamicPhiRoad_ = false;
  LogTrace("EcalClusters") << "dynamicEThres: " << dynamicEThres_ << " : A,B " << eThresA_ << ", " << eThresB_;
  LogTrace("EcalClusters") << "Eseed: " << Eseed << " , Xi: " << Xi << ", UseEtForXi: " << UseEtForXi;
 
  //if (dynamicPhiRoad_) phiRoadAlgo_ = new BremRecoveryPhiRoadAlgo(bremRecoveryPset);
  posCalculator_ = posCalculator;
  topo_ = new EcalBarrelHardcodedTopology();
 
  std::sort(v_chstatus_.begin(), v_chstatus_.end());
}
 
// Return a vector of clusters from a collection of EcalRecHits:
void HybridClusterAlgo::makeClusters(const EcalRecHitCollection* recColl,
                                     const CaloSubdetectorGeometry* geometry,
                                     reco::BasicClusterCollection& basicClusters,
                                     const EcalSeverityLevelAlgo* sevLv,
                                     bool regional,
                                     const std::vector<RectangularEtaPhiRegion>& regions) {
  //clear vector of seeds
  seeds.clear();
  //clear flagged crystals
  excludedCrys_.clear();
  //clear map of supercluster/basiccluster association
  clustered_.clear();
  //clear set of used detids
  useddetids.clear();
  //clear vector of seed clusters
  seedClus_.clear();
  //Pass in a pointer to the collection.
  recHits_ = recColl;
 
  LogTrace("EcalClusters") << "Cleared vectors, starting clusterization...";
  LogTrace("EcalClusters") << " Purple monkey aardvark.";
  //
 
  int nregions = 0;
  if (regional)
    nregions = regions.size();
 
  if (!regional || nregions) {
    EcalRecHitCollection::const_iterator it;
 
    for (it = recHits_->begin(); it != recHits_->end(); it++) {
      //Make the vector of seeds that we're going to use.
      //One of the few places position is used, needed for ET calculation.
      auto this_cell = geometry->getGeometry(it->id());
      const GlobalPoint& position = this_cell->getPosition();
 
      // Require that RecHit is within clustering region in case
      // of regional reconstruction
      bool withinRegion = false;
      if (regional) {
        std::vector<RectangularEtaPhiRegion>::const_iterator region;
        for (region = regions.begin(); region != regions.end(); region++) {
          if (region->inRegion(this_cell->etaPos(), this_cell->phiPos())) {
            withinRegion = true;
            break;
          }
        }
      }
 
      if (!regional || withinRegion) {
        //Must pass seed threshold
        float ET = it->energy() * position.basicVector().unit().perp();
 
        LogTrace("EcalClusters") << "Seed crystal: ";
 
        if (ET > eb_st) {
          // avoid seeding for anomalous channels
          if (!it->checkFlag(EcalRecHit::kGood)) {  // if rechit is good, no need for further checks
            if (it->checkFlags(v_chstatus_)) {
              if (excludeFromCluster_)
                excludedCrys_.insert(it->id());
              continue;  // the recHit has to be excluded from seeding
            }
          }
 
          int severityFlag = sevLv->severityLevel(it->id(), *recHits_);
          std::vector<int>::const_iterator sit =
              std::find(v_severitylevel_.begin(), v_severitylevel_.end(), severityFlag);
          LogTrace("EcalClusters") << "found flag: " << severityFlag;
 
          if (sit != v_severitylevel_.end()) {
            if (excludeFromCluster_)
              excludedCrys_.insert(it->id());
            continue;
          }
          seeds.push_back(*it);
 
          LogTrace("EcalClusters") << "Seed ET: " << ET;
          LogTrace("EcalClsuters") << "Seed E: " << it->energy();
        }
      }
    }
  }
 
  //Yay sorting.
  LogTrace("EcalClusters") << "Built vector of seeds, about to sort them...";
 
  //Needs three argument sort with seed comparison operator
  sort(seeds.begin(), seeds.end(), [](auto const& x, auto const& y) { return x.energy() > y.energy(); });
 
  LogTrace("EcalClusters") << "done";
 
  //Now to do the work.
  LogTrace("EcalClusters") << "About to call mainSearch...";
  mainSearch(recColl, geometry);
  LogTrace("EcalClusters") << "done";
 
  //Hand the basicclusters back to the producer.  It has to
  //put them in the event.  Then we can make superclusters.
  std::map<int, reco::BasicClusterCollection>::iterator bic;
  for (bic = clustered_.begin(); bic != clustered_.end(); bic++) {
    reco::BasicClusterCollection bl = bic->second;
    for (int j = 0; j < int(bl.size()); ++j) {
      basicClusters.push_back(bl[j]);
    }
  }
 
  //Yay more sorting.
  sort(basicClusters.rbegin(), basicClusters.rend(), isClusterEtLess);
  //Done!
  LogTrace("EcalClusters") << "returning to producer. ";
}
 
void HybridClusterAlgo::mainSearch(const EcalRecHitCollection* hits, const CaloSubdetectorGeometry* geometry) {
  LogTrace("EcalClusters") << "HybridClusterAlgo Algorithm - looking for clusters";
  LogTrace("EcalClusters") << "Found the following clusters:";
 
  // Loop over seeds:
  std::vector<EcalRecHit>::iterator it;
  int clustercounter = 0;
 
  for (it = seeds.begin(); it != seeds.end(); it++) {
    std::vector<reco::BasicCluster> thisseedClusters;
    DetId itID = it->id();
 
    // make sure the current seed has not been used/will not be used in the future:
    std::set<DetId>::iterator seed_in_rechits_it = useddetids.find(itID);
 
    if (seed_in_rechits_it != useddetids.end())
      continue;
    //If this seed is already used, then don't use it again.
 
    // output some info on the hit:
    LogTrace("EcalClusters") << "*****************************************************"
                             << "Seed of energy E = " << it->energy() << " @ " << EBDetId(itID)
                             << "*****************************************************";
 
    //Make a navigator, and set it to the seed cell.
    EcalBarrelNavigatorHT navigator(itID, topo_);
 
    //Now use the navigator to start building dominoes.
 
    //Walking positive in phi:
    std::vector<double> dominoEnergyPhiPlus;                   //Here I will store the results of the domino sums
    std::vector<std::vector<EcalRecHit> > dominoCellsPhiPlus;  //These are the actual EcalRecHit for dominos.
 
    //Walking negative in phi
    std::vector<double> dominoEnergyPhiMinus;                   //Here I will store the results of the domino sums
    std::vector<std::vector<EcalRecHit> > dominoCellsPhiMinus;  //These are the actual EcalRecHit for dominos.
 
    //The two sets together.
    std::vector<double> dominoEnergy;                   //Here I will store the results of the domino sums
    std::vector<std::vector<EcalRecHit> > dominoCells;  //These are the actual EcalRecHit for dominos.
 
    //First, the domino about the seed:
    std::vector<EcalRecHit> initialdomino;
    double e_init = makeDomino(navigator, initialdomino);
    if (e_init < Eseed)
      continue;
 
    LogTrace("EcalClusters") << "Made initial domino";
 
    //
    // compute the phi road length
    double phiSteps;
    double et5x5 = et25(navigator, hits, geometry);
    if (dynamicPhiRoad_ && e_init > 0) {
      phiSteps = phiRoadAlgo_->barrelPhiRoad(et5x5);
      navigator.home();
    } else
      phiSteps = phiSteps_;
 
    //Positive phi steps.
    for (int i = 0; i < phiSteps; ++i) {
      //remember, this always increments the current position of the navigator.
      DetId centerD = navigator.north();
      if (centerD.null())
        continue;
      LogTrace("EcalClusters") << "Step ++" << i << " @ " << EBDetId(centerD);
      EcalBarrelNavigatorHT dominoNav(centerD, topo_);
 
      //Go get the new domino.
      std::vector<EcalRecHit> dcells;
      double etemp = makeDomino(dominoNav, dcells);
 
      //save this information
      dominoEnergyPhiPlus.push_back(etemp);
      dominoCellsPhiPlus.push_back(dcells);
    }
    LogTrace("EcalClusters") << "Got positive dominos";
    //return to initial position
    navigator.home();
 
    //Negative phi steps.
    for (int i = 0; i < phiSteps; ++i) {
      //remember, this always decrements the current position of the navigator.
      DetId centerD = navigator.south();
      if (centerD.null())
        continue;
 
      LogTrace("EcalClusters") << "Step --" << i << " @ " << EBDetId(centerD);
      EcalBarrelNavigatorHT dominoNav(centerD, topo_);
 
      //Go get the new domino.
      std::vector<EcalRecHit> dcells;
      double etemp = makeDomino(dominoNav, dcells);
 
      //save this information
      dominoEnergyPhiMinus.push_back(etemp);
      dominoCellsPhiMinus.push_back(dcells);
    }
 
    LogTrace("EcalClusters") << "Got negative dominos: ";
 
    //Assemble this information:
    for (int i = int(dominoEnergyPhiMinus.size()) - 1; i >= 0; --i) {
      dominoEnergy.push_back(dominoEnergyPhiMinus[i]);
      dominoCells.push_back(dominoCellsPhiMinus[i]);
    }
    dominoEnergy.push_back(e_init);
    dominoCells.push_back(initialdomino);
    for (int i = 0; i < int(dominoEnergyPhiPlus.size()); ++i) {
      dominoEnergy.push_back(dominoEnergyPhiPlus[i]);
      dominoCells.push_back(dominoCellsPhiPlus[i]);
    }
 
    //Ok, now I have all I need in order to go ahead and make clusters.
    LogTrace("EcalClusters") << "Dumping domino energies: ";
 
    //for (int i=0;i<int(dominoEnergy.size());++i){
    //       LogTrace("EcalClusters") << "Domino: " << i << " E: " << dominoEnergy[i] ;
    //      }
    //Identify the peaks in this set of dominos:
    //Peak==a domino whose energy is greater than the two adjacent dominos.
    //thus a peak in the local sense.
    double etToE(1.);
    if (!UseEtForXi) {
      etToE = 1. / e2Et(navigator, hits, geometry);
    }
    std::vector<int> PeakIndex;
    for (int i = 1; i < int(dominoEnergy.size()) - 1; ++i) {
      if (dominoEnergy[i] > dominoEnergy[i - 1] && dominoEnergy[i] >= dominoEnergy[i + 1] &&
          dominoEnergy[i] > sqrt(Eseed * Eseed + Xi * Xi * et5x5 * et5x5 * etToE *
                                                     etToE)) {  // Eseed increases ~proportiaonally to et5x5
        PeakIndex.push_back(i);
      }
    }
 
    LogTrace("EcalClusters") << "Found: " << PeakIndex.size() << " peaks.";
 
    //Order these peaks by energy:
    for (int i = 0; i < int(PeakIndex.size()); ++i) {
      for (int j = 0; j < int(PeakIndex.size()) - 1; ++j) {
        if (dominoEnergy[PeakIndex[j]] < dominoEnergy[PeakIndex[j + 1]]) {
          int ihold = PeakIndex[j + 1];
          PeakIndex[j + 1] = PeakIndex[j];
          PeakIndex[j] = ihold;
        }
      }
    }
 
    std::vector<int> OwnerShip;
    std::vector<double> LumpEnergy;
    for (int i = 0; i < int(dominoEnergy.size()); ++i)
      OwnerShip.push_back(-1);
 
    //Loop over peaks.
    double eThres = eThres_;
    double e5x5 = 0.0;
    for (int i = 0; i < int(PeakIndex.size()); ++i) {
      int idxPeak = PeakIndex[i];
      OwnerShip[idxPeak] = i;
      double lump = dominoEnergy[idxPeak];
 
      // compute eThres for this peak
      // if set to dynamic (otherwise uncanged from
      // fixed setting
      if (dynamicEThres_) {
        //std::cout << "i : " << i << " idxPeak " << idxPeak << std::endl;
        //std::cout << "    the dominoEnergy.size() = " << dominoEnergy.size() << std::endl;
        // compute e5x5 for this seed crystal
        //std::cout << "idxPeak, phiSteps " << idxPeak << ", " << phiSteps << std::endl;
        e5x5 = lump;
        //std::cout << "lump " << e5x5 << std::endl;
        if ((idxPeak + 1) < (int)dominoEnergy.size())
          e5x5 += dominoEnergy[idxPeak + 1];
        //std::cout << "+1 " << e5x5 << std::endl;
        if ((idxPeak + 2) < (int)dominoEnergy.size())
          e5x5 += dominoEnergy[idxPeak + 2];
        //std::cout << "+2 " << e5x5 << std::endl;
        if ((idxPeak - 1) > 0)
          e5x5 += dominoEnergy[idxPeak - 1];
        //std::cout << "-1 " << e5x5 << std::endl;
        if ((idxPeak - 2) > 0)
          e5x5 += dominoEnergy[idxPeak - 2];
        //std::cout << "-2 " << e5x5 << std::endl;
        // compute eThres
        eThres = (eThresA_ * e5x5) + eThresB_;
        //std::cout << eThres << std::endl;
        //std::cout << std::endl;
      }
 
      //Loop over adjacent dominos at higher phi
      for (int j = idxPeak + 1; j < int(dominoEnergy.size()); ++j) {
        if (OwnerShip[j] == -1 && dominoEnergy[j] > eThres && dominoEnergy[j] <= dominoEnergy[j - 1]) {
          OwnerShip[j] = i;
          lump += dominoEnergy[j];
        } else {
          break;
        }
      }
      //loop over adjacent dominos at lower phi.  Sum up energy of lumps.
      for (int j = idxPeak - 1; j >= 0; --j) {
        if (OwnerShip[j] == -1 && dominoEnergy[j] > eThres && dominoEnergy[j] <= dominoEnergy[j + 1]) {
          OwnerShip[j] = i;
          lump += dominoEnergy[j];
        } else {
          break;
        }
      }
      LumpEnergy.push_back(lump);
    }
 
    //Make the basic clusters:
    for (int i = 0; i < int(PeakIndex.size()); ++i) {
      bool HasSeedCrystal = false;
      //One cluster for each peak.
      std::vector<EcalRecHit> recHits;
      std::vector<std::pair<DetId, float> > dets;
      int nhits = 0;
      for (int j = 0; j < int(dominoEnergy.size()); ++j) {
        if (OwnerShip[j] == i) {
          std::vector<EcalRecHit> temp = dominoCells[j];
          for (int k = 0; k < int(temp.size()); ++k) {
            dets.push_back(std::pair<DetId, float>(temp[k].id(), 1.));  // by default energy fractions are 1
            if (temp[k].id() == itID)
              HasSeedCrystal = true;
            recHits.push_back(temp[k]);
            nhits++;
          }
        }
      }
      LogTrace("EcalClusters") << "Adding a cluster with: " << nhits;
      LogTrace("EcalClusters") << "total E: " << LumpEnergy[i];
      LogTrace("EcalClusters") << "total dets: " << dets.size();
 
      //Get Calorimeter position
      Point pos = posCalculator_.Calculate_Location(dets, hits, geometry);
 
      //double totChi2=0;
      //double totE=0;
      std::vector<std::pair<DetId, float> > usedHits;
      for (int blarg = 0; blarg < int(recHits.size()); ++blarg) {
        //totChi2 +=0;
        //totE+=recHits[blarg].energy();
        usedHits.push_back(std::make_pair<DetId, float>(recHits[blarg].id(), 1.0));
        useddetids.insert(recHits[blarg].id());
      }
 
      //if (totE>0)
      //totChi2/=totE;
 
      if (HasSeedCrystal) {
        // note that this "basiccluster" has the seed crystal of the hyrbid, so record it
        seedClus_.push_back(reco::BasicCluster(
            LumpEnergy[i], pos, reco::CaloID(reco::CaloID::DET_ECAL_BARREL), usedHits, reco::CaloCluster::hybrid, itID));
        // and also add to the vector of clusters that will be used in constructing
        // the supercluster
        thisseedClusters.push_back(reco::BasicCluster(
            LumpEnergy[i], pos, reco::CaloID(reco::CaloID::DET_ECAL_BARREL), usedHits, reco::CaloCluster::hybrid, itID));
      } else {
        // note that if this "basiccluster" is not the one that seeded the hybrid,
        // the seed crystal is unset in this entry in the vector of clusters that will
        // be used in constructing the super cluster
        thisseedClusters.push_back(reco::BasicCluster(
            LumpEnergy[i], pos, reco::CaloID(reco::CaloID::DET_ECAL_BARREL), usedHits, reco::CaloCluster::hybrid));
      }
    }
 
    // Make association so that superclusters can be made later.
    // but only if some BasicClusters have been found...
    if (!thisseedClusters.empty()) {
      clustered_.insert(std::make_pair(clustercounter, thisseedClusters));
      clustercounter++;
    }
  }  //Seed loop
 
}  // end of mainSearch
 
reco::SuperClusterCollection HybridClusterAlgo::makeSuperClusters(const reco::CaloClusterPtrVector& clustersCollection) {
  //Here's what we'll return.
  reco::SuperClusterCollection SCcoll;
 
  //Here's our map iterator that gives us the appropriate association.
  std::map<int, reco::BasicClusterCollection>::iterator mapit;
  for (mapit = clustered_.begin(); mapit != clustered_.end(); mapit++) {
    reco::CaloClusterPtrVector thissc;
    reco::CaloClusterPtr seed;  //This is not really a seed, but I need to tell SuperCluster something.
    //So I choose the highest energy basiccluster in the SuperCluster.
 
    std::vector<reco::BasicCluster> thiscoll = mapit->second;  //This is the set of BasicClusters in this
    //SuperCluster
 
    double ClusterE = 0;  //Sum of cluster energies for supercluster.
    //Holders for position of this supercluster.
    double posX = 0;
    double posY = 0;
    double posZ = 0;
 
    //Loop over this set of basic clusters, find their references, and add them to the
    //supercluster.  This could be somehow more efficient.
 
    for (int i = 0; i < int(thiscoll.size()); ++i) {
      reco::BasicCluster thisclus = thiscoll[i];  //The Cluster in question.
      for (int j = 0; j < int(clustersCollection.size()); ++j) {
        //Find the appropriate cluster from the list of references
        reco::BasicCluster cluster_p = *clustersCollection[j];
        if (thisclus == cluster_p) {  //Comparison based on energy right now.
          thissc.push_back(clustersCollection[j]);
          bool isSeed = false;
          for (int qu = 0; qu < int(seedClus_.size()); ++qu) {
            if (cluster_p == seedClus_[qu])
              isSeed = true;
          }
          if (isSeed)
            seed = clustersCollection[j];
 
          ClusterE += cluster_p.energy();
          posX += cluster_p.energy() * cluster_p.position().X();
          posY += cluster_p.energy() * cluster_p.position().Y();
          posZ += cluster_p.energy() * cluster_p.position().Z();
        }
      }  //End loop over finding references.
    }    //End loop over clusters.
 
    posX /= ClusterE;
    posY /= ClusterE;
    posZ /= ClusterE;
 
    /* //This part is moved to EgammaSCEnergyCorrectionAlgo
           double preshowerE = 0.;
           double phiWidth = 0.;
           double etaWidth = 0.;
        //Calculate phiWidth & etaWidth for SuperClusters
        reco::SuperCluster suCl(ClusterE, math::XYZPoint(posX, posY, posZ), seed, thissc, preshowerE, phiWidth, etaWidth);
        SCShape_->Calculate_Covariances(suCl);
        phiWidth = SCShape_->phiWidth();
        etaWidth = SCShape_->etaWidth();
        //Assign phiWidth & etaWidth to SuperCluster as data members
        suCl.setPhiWidth(phiWidth);
        suCl.setEtaWidth(etaWidth);
         */
 
    reco::SuperCluster suCl(ClusterE, math::XYZPoint(posX, posY, posZ), seed, thissc);
    SCcoll.push_back(suCl);
 
    LogTrace("EcalClusters") << "Super cluster sum: " << ClusterE;
    LogTrace("EcalClusters") << "Made supercluster with energy E: " << suCl.energy();
 
  }  //end loop over map
  sort(SCcoll.rbegin(), SCcoll.rend(), isClusterEtLess);
  return SCcoll;
}
 
double HybridClusterAlgo::makeDomino(EcalBarrelNavigatorHT& navigator, std::vector<EcalRecHit>& cells) {
  //At the beginning of this function, the navigator starts at the middle of the domino,
  //and that's where EcalBarrelNavigator::home() should send it.
  //Walk one crystal in eta to either side of the initial point.  Sum the three cell energies.
  //If the resultant energy is larger than Ewing, then go an additional cell to either side.
  //Returns:  Total domino energy.  Also, stores the cells used to create domino in the vector.
  cells.clear();
  double Etot = 0;
 
  //Ready?  Get the starting cell.
  DetId center = navigator.pos();
  EcalRecHitCollection::const_iterator center_it = recHits_->find(center);
 
  if (center_it != recHits_->end()) {
    EcalRecHit SeedHit = *center_it;
    if (useddetids.find(center) == useddetids.end() && excludedCrys_.find(center) == excludedCrys_.end()) {
      Etot += SeedHit.energy();
      cells.push_back(SeedHit);
    }
  }
  //One step upwards in Ieta:
  DetId ieta1 = navigator.west();
  EcalRecHitCollection::const_iterator eta1_it = recHits_->find(ieta1);
  if (eta1_it != recHits_->end()) {
    EcalRecHit UpEta = *eta1_it;
    if (useddetids.find(ieta1) == useddetids.end() && excludedCrys_.find(ieta1) == excludedCrys_.end()) {
      Etot += UpEta.energy();
      cells.push_back(UpEta);
    }
  }
 
  //Go back to the middle.
  navigator.home();
 
  //One step downwards in Ieta:
  DetId ieta2 = navigator.east();
  EcalRecHitCollection::const_iterator eta2_it = recHits_->find(ieta2);
  if (eta2_it != recHits_->end()) {
    EcalRecHit DownEta = *eta2_it;
    if (useddetids.find(ieta2) == useddetids.end() && excludedCrys_.find(ieta2) == excludedCrys_.end()) {
      Etot += DownEta.energy();
      cells.push_back(DownEta);
    }
  }
 
  //Now check the energy.  If smaller than Ewing, then we're done.  If greater than Ewing, we have to
  //add two additional cells, the 'wings'
  if (Etot < Ewing) {
    navigator.home();  //Needed even here!!
    return Etot;       //Done!  Not adding 'wings'.
  }
 
  //Add the extra 'wing' cells.  Remember, we haven't sent the navigator home,
  //we're still on the DownEta cell.
  if (ieta2 != DetId(0)) {
    DetId ieta3 = navigator.east();  //Take another step downward.
    EcalRecHitCollection::const_iterator eta3_it = recHits_->find(ieta3);
    if (eta3_it != recHits_->end()) {
      EcalRecHit DownEta2 = *eta3_it;
      if (useddetids.find(ieta3) == useddetids.end() && excludedCrys_.find(ieta3) == excludedCrys_.end()) {
        Etot += DownEta2.energy();
        cells.push_back(DownEta2);
      }
    }
  }
  //Now send the navigator home.
  navigator.home();
  navigator.west();  //Now you're on eta1_it
  if (ieta1 != DetId(0)) {
    DetId ieta4 = navigator.west();  //Take another step upward.
    EcalRecHitCollection::const_iterator eta4_it = recHits_->find(ieta4);
    if (eta4_it != recHits_->end()) {
      EcalRecHit UpEta2 = *eta4_it;
      if (useddetids.find(ieta4) == useddetids.end() && excludedCrys_.find(ieta4) == excludedCrys_.end()) {
        Etot += UpEta2.energy();
        cells.push_back(UpEta2);
      }
    }
  }
  navigator.home();
  return Etot;
}
 
double HybridClusterAlgo::et25(EcalBarrelNavigatorHT& navigator,
                               const EcalRecHitCollection* hits,
                               const CaloSubdetectorGeometry* geometry) {
  DetId thisDet;
  std::vector<std::pair<DetId, float> > dets;
  dets.clear();
  EcalRecHitCollection::const_iterator hit;
  double energySum = 0.0;
 
  for (int dx = -2; dx < 3; ++dx) {
    for (int dy = -2; dy < 3; ++dy) {
      //std::cout << "dx, dy " << dx << ", " << dy << std::endl;
      thisDet = navigator.offsetBy(dx, dy);
      navigator.home();
 
      if (thisDet != DetId(0)) {
        hit = recHits_->find(thisDet);
        if (hit != recHits_->end()) {
          dets.push_back(std::pair<DetId, float>(thisDet, 1.));  // by default hit energy fraction is set to 1
          energySum += hit->energy();
        }
      }
    }
  }
 
  // convert it to ET
  //std::cout << "dets.size(), energySum: " << dets.size() << ", " << energySum << std::endl;
  Point pos = posCalculator_.Calculate_Location(dets, hits, geometry);
  double et = energySum / cosh(pos.eta());
  return et;
}
 
double HybridClusterAlgo::e2Et(EcalBarrelNavigatorHT& navigator,
                               const EcalRecHitCollection* hits,
                               const CaloSubdetectorGeometry* geometry) {
  DetId thisDet;
  std::vector<std::pair<DetId, float> > dets;
  dets.clear();
  EcalRecHitCollection::const_iterator hit;
 
  for (int dx = -2; dx < 3; ++dx) {
    for (int dy = -2; dy < 3; ++dy) {
      thisDet = navigator.offsetBy(dx, dy);
      navigator.home();
 
      if (thisDet != DetId(0)) {
        hit = recHits_->find(thisDet);
        if (hit != recHits_->end()) {
          dets.push_back(std::pair<DetId, float>(thisDet, 1.));  // by default hit energy fraction is set to 1
        }
      }
    }
  }
 
  // compute coefficient to turn E into Et
  Point pos = posCalculator_.Calculate_Location(dets, hits, geometry);
  return 1 / cosh(pos.eta());
}