CSCSegAlgoPreClustering Class Reference

#include <CSCSegAlgoPreClustering.h>

Public Types
typedef std::vector< const CSCRecHit2D * >	ChamberHitContainer

Public Member Functions
std::vector< std::vector< const CSCRecHit2D * > >	clusterHits (const CSCChamber *aChamber, const ChamberHitContainer &rechits)
	clusterize More...
	CSCSegAlgoPreClustering (const edm::ParameterSet &ps)
	constructor More...
	~CSCSegAlgoPreClustering ()
	destructor More...

Private Attributes
bool	debug
double	dXclusBoxMax
double	dYclusBoxMax
float	err_x
float	err_y
float	mean_x
float	mean_y
const CSCChamber *	theChamber

Detailed Description

Definition at line 20 of file CSCSegAlgoPreClustering.h.

Member Typedef Documentation

ChamberHitContainer

typedef std::vector<const CSCRecHit2D*> CSCSegAlgoPreClustering::ChamberHitContainer

Definition at line 22 of file CSCSegAlgoPreClustering.h.

Constructor & Destructor Documentation

CSCSegAlgoPreClustering()

CSCSegAlgoPreClustering::CSCSegAlgoPreClustering ( const edm::ParameterSet &  ps )

explicit

constructor

Definition at line 30 of file CSCSegAlgoPreClustering.cc.

                                                                          {
  dXclusBoxMax = ps.getParameter<double>("dXclusBoxMax");
  dYclusBoxMax = ps.getParameter<double>("dYclusBoxMax");
  debug = ps.getUntrackedParameter<bool>("CSCSegmentDebug");
}

References debug, dXclusBoxMax, dYclusBoxMax, edm::ParameterSet::getParameter(), and edm::ParameterSet::getUntrackedParameter().

~CSCSegAlgoPreClustering()

CSCSegAlgoPreClustering::~CSCSegAlgoPreClustering

(

)

destructor

Definition at line 39 of file CSCSegAlgoPreClustering.cc.

{}

Member Function Documentation

clusterHits()

std::vector< std::vector< const CSCRecHit2D * > > CSCSegAlgoPreClustering::clusterHits	(	const CSCChamber *	aChamber,
		const ChamberHitContainer &	rechits
	)

clusterize

Definition at line 44 of file CSCSegAlgoPreClustering.cc.

                                                                                                                       {
  theChamber = aChamber;
 
  std::vector<ChamberHitContainer> rechits_clusters;  // this is a collection of groups of rechits
 
  //float dXclus = 0.0;
  //float dYclus = 0.0;
  float dXclus_box = 0.0;
  float dYclus_box = 0.0;
 
  std::vector<const CSCRecHit2D*> temp;
 
  std::vector<ChamberHitContainer> seeds;
 
  std::vector<float> running_meanX;
  std::vector<float> running_meanY;
 
  std::vector<float> seed_minX;
  std::vector<float> seed_maxX;
  std::vector<float> seed_minY;
  std::vector<float> seed_maxY;
 
  // split rechits into subvectors and return vector of vectors:
  // Loop over rechits
  // Create one seed per hit
  for (unsigned int i = 0; i < rechits.size(); ++i) {
    temp.clear();
 
    temp.push_back(rechits[i]);
 
    seeds.push_back(temp);
 
    // First added hit in seed defines the mean to which the next hit is compared
    // for this seed.
 
    running_meanX.push_back(rechits[i]->localPosition().x());
    running_meanY.push_back(rechits[i]->localPosition().y());
 
    // set min/max X and Y for box containing the hits in the precluster:
    seed_minX.push_back(rechits[i]->localPosition().x());
    seed_maxX.push_back(rechits[i]->localPosition().x());
    seed_minY.push_back(rechits[i]->localPosition().y());
    seed_maxY.push_back(rechits[i]->localPosition().y());
  }
 
  // merge clusters that are too close
  // measure distance between final "running mean"
  for (size_t NNN = 0; NNN < seeds.size(); ++NNN) {
    for (size_t MMM = NNN + 1; MMM < seeds.size(); ++MMM) {
      if (running_meanX[MMM] == 999999. || running_meanX[NNN] == 999999.) {
        std::cout << "We should never see this line now!!!" << std::endl;
        continue;  //skip seeds that have been used
      }
 
      // calculate cut criteria for simple running mean distance cut:
      //dXclus = fabs(running_meanX[NNN] - running_meanX[MMM]);
      //dYclus = fabs(running_meanY[NNN] - running_meanY[MMM]);
 
      // calculate minmal distance between precluster boxes containing the hits:
      if (running_meanX[NNN] > running_meanX[MMM])
        dXclus_box = seed_minX[NNN] - seed_maxX[MMM];
      else
        dXclus_box = seed_minX[MMM] - seed_maxX[NNN];
      if (running_meanY[NNN] > running_meanY[MMM])
        dYclus_box = seed_minY[NNN] - seed_maxY[MMM];
      else
        dYclus_box = seed_minY[MMM] - seed_maxY[NNN];
 
      if (dXclus_box < dXclusBoxMax && dYclus_box < dYclusBoxMax) {
        // merge clusters!
        // merge by adding seed NNN to seed MMM and erasing seed NNN
 
        // calculate running mean for the merged seed:
        running_meanX[MMM] = (running_meanX[NNN] * seeds[NNN].size() + running_meanX[MMM] * seeds[MMM].size()) /
                             (seeds[NNN].size() + seeds[MMM].size());
        running_meanY[MMM] = (running_meanY[NNN] * seeds[NNN].size() + running_meanY[MMM] * seeds[MMM].size()) /
                             (seeds[NNN].size() + seeds[MMM].size());
 
        // update min/max X and Y for box containing the hits in the merged cluster:
        if (seed_minX[NNN] <= seed_minX[MMM])
          seed_minX[MMM] = seed_minX[NNN];
        if (seed_maxX[NNN] > seed_maxX[MMM])
          seed_maxX[MMM] = seed_maxX[NNN];
        if (seed_minY[NNN] <= seed_minY[MMM])
          seed_minY[MMM] = seed_minY[NNN];
        if (seed_maxY[NNN] > seed_maxY[MMM])
          seed_maxY[MMM] = seed_maxY[NNN];
 
        // add seed NNN to MMM (lower to larger number)
        seeds[MMM].insert(seeds[MMM].end(), seeds[NNN].begin(), seeds[NNN].end());
 
        // mark seed NNN as used (at the moment just set running mean to 999999.)
        running_meanX[NNN] = 999999.;
        running_meanY[NNN] = 999999.;
        // we have merged a seed (NNN) to the highter seed (MMM) - need to contimue to
        // next seed (NNN+1)
        break;
      }
    }
  }
 
  // hand over the final seeds to the output
  // would be more elegant if we could do the above step with
  // erasing the merged ones, rather than the
  for (size_t NNN = 0; NNN < seeds.size(); ++NNN) {
    if (running_meanX[NNN] == 999999.)
      continue;  //skip seeds that have been marked as used up in merging
    rechits_clusters.push_back(seeds[NNN]);
    mean_x = running_meanX[NNN];
    mean_y = running_meanY[NNN];
    err_x =
        (seed_maxX[NNN] - seed_minX[NNN]) / 3.464101615;  // use box size divided by sqrt(12) as position error estimate
    err_y =
        (seed_maxY[NNN] - seed_minY[NNN]) / 3.464101615;  // use box size divided by sqrt(12) as position error estimate
  }
 
  return rechits_clusters;
}

References gather_cfg::cout, dXclusBoxMax, dYclusBoxMax, mps_fire::end, err_x, err_y, mps_fire::i, mean_x, mean_y, HI_PhotonSkim_cff::rechits, InitialStep_cff::seeds, findQualityFiles::size, groupFilesInBlocks::temp, theChamber, x, and y.

Referenced by CSCSegAlgoDF::run().

Member Data Documentation

debug

bool CSCSegAlgoPreClustering::debug

private

Definition at line 35 of file CSCSegAlgoPreClustering.h.

Referenced by CSCSegAlgoPreClustering(), runTauIdMVA.TauIDEmbedder::loadMVA_WPs_run2_2017(), and runTauIdMVA.TauIDEmbedder::runTauID().

dXclusBoxMax

double CSCSegAlgoPreClustering::dXclusBoxMax

private

Definition at line 36 of file CSCSegAlgoPreClustering.h.

Referenced by clusterHits(), and CSCSegAlgoPreClustering().

dYclusBoxMax

double CSCSegAlgoPreClustering::dYclusBoxMax

private

Definition at line 37 of file CSCSegAlgoPreClustering.h.

Referenced by clusterHits(), and CSCSegAlgoPreClustering().

err_x

float CSCSegAlgoPreClustering::err_x

private

Definition at line 39 of file CSCSegAlgoPreClustering.h.

Referenced by clusterHits().

err_y

float CSCSegAlgoPreClustering::err_y

private

Definition at line 39 of file CSCSegAlgoPreClustering.h.

Referenced by clusterHits().

mean_x

float CSCSegAlgoPreClustering::mean_x

private

Definition at line 39 of file CSCSegAlgoPreClustering.h.

Referenced by clusterHits().

mean_y

float CSCSegAlgoPreClustering::mean_y

private

Definition at line 39 of file CSCSegAlgoPreClustering.h.

Referenced by clusterHits().

theChamber

const CSCChamber* CSCSegAlgoPreClustering::theChamber

private

Definition at line 40 of file CSCSegAlgoPreClustering.h.

Referenced by clusterHits().