DivisiveVertexFinder Class Reference

#include <RecoPixelVertexing/PixelVertexFinding/interface/DivisiveVertexFinder.h>

Public Member Functions
	DivisiveVertexFinder (double track_pt_min, double track_pt_max, double track_chi2_max, double track_prob_min, double zOffset=5.0, int ntrkMin=5, bool useError=true, double zSeparation=0.05, bool wtAverage=true, int verbosity=0)
bool	findVertexes (const reco::TrackRefVector &trks, reco::VertexCollection &vertexes)
	Run the divisive algorithm and return a vector of vertexes for the input track collection. More...
bool	findVertexesAlt (const reco::TrackRefVector &trks, reco::VertexCollection &vertexes, const math::XYZPoint &bs)
	~DivisiveVertexFinder ()

Private Attributes
pixeltemp::DivisiveClusterizer1D< reco::Track >	divmeth_
	We use Wolfgang's templated class that implements the actual divisive method. More...
int	ntrkMin_
PVClusterComparer *	pvComparer_
bool	useError_
int	verbose_
bool	wtAverage_
double	zOffset_
	Cuts on vertex formation and other options. More...
double	zSeparation_

Detailed Description

Description: Fits a primary vertex in 1D (z) using the "divisive method"

Implementation: This class was ported from ORCA by me (Aaron). It was originally written by ... Find the PV candidates with a simple divisive method. Divide the luminosity region in several regions according to the track distance and for each of them make a PVCluster. Iteratively discard tracks and recover them in a new PVCluster. Return a sorted vector<Vertex> (aka VertexCollection) with the z coordinate of PV candidates

Parameters

ntkmin	Minimum number of tracks required to form a cluster.
useError	physical distances or weighted distances.
zsep	Maximum distance between two adjacent tracks that belong to the same initial cluster.
wei	Compute the cluster "center" with an unweighted or a weighted average of the tracks. Weighted means weighted with the error of the data point.

Author

Aaron Dominguez (UNL)

Definition at line 34 of file DivisiveVertexFinder.h.

Constructor & Destructor Documentation

DivisiveVertexFinder()

DivisiveVertexFinder::DivisiveVertexFinder	(	double	track_pt_min,
		double	track_pt_max,
		double	track_chi2_max,
		double	track_prob_min,
		double	zOffset = 5.0,
		int	ntrkMin = 5,
		bool	useError = true,
		double	zSeparation = 0.05,
		bool	wtAverage = true,
		int	verbosity = 0
	)

Definition at line 13 of file DivisiveVertexFinder.cc.

    : zOffset_(zOffset),
      zSeparation_(zSeparation),
      ntrkMin_(ntrkMin),
      useError_(useError),
      wtAverage_(wtAverage),
      divmeth_(zOffset, ntrkMin, useError, zSeparation, wtAverage),
      verbose_(verbosity) {
  pvComparer_ = new PVClusterComparer(track_pt_min, track_pt_max, track_chi2_max, track_prob_min);
}

References pvComparer_, HLT_FULL_cff::track_chi2_max, HLT_FULL_cff::track_prob_min, HLT_FULL_cff::track_pt_max, and HLT_FULL_cff::track_pt_min.

~DivisiveVertexFinder()

DivisiveVertexFinder::~DivisiveVertexFinder

(

)

Definition at line 33 of file DivisiveVertexFinder.cc.

{}

Member Function Documentation

findVertexes()

bool DivisiveVertexFinder::findVertexes	(	const reco::TrackRefVector &	trks,
		reco::VertexCollection &	vertexes
	)

Run the divisive algorithm and return a vector of vertexes for the input track collection.

Definition at line 35 of file DivisiveVertexFinder.cc.

                                                                        {  // output
  PVPositionBuilder pos;
  Measurement1D vz;
  if (wtAverage_) {
    vz = pos.wtAverage(trks);
  } else {
    vz = pos.average(trks);
  }
  reco::Vertex::Error err;
  err(2, 2) = vz.error() * vz.error();
 
  reco::Vertex v(reco::Vertex::Point(0, 0, vz.value()), err, 0, 1, trks.size());
  for (unsigned int i = 0; i < trks.size(); i++) {
    double vz = trks[i]->vz();
    if (edm::isNotFinite(vz))
      continue;
    v.add(reco::TrackBaseRef(trks[i]));
  }
 
  vertexes.push_back(v);
 
  return true;
}

References submitPVResolutionJobs::err, Measurement1D::error(), mps_fire::i, edm::isNotFinite(), edm::RefVector< C, T, F >::size(), findQualityFiles::v, Measurement1D::value(), jets_cff::vertexes, and wtAverage_.

Referenced by PixelVertexProducer::produce().

findVertexesAlt()

bool DivisiveVertexFinder::findVertexesAlt	(	const reco::TrackRefVector &	trks,
		reco::VertexCollection &	vertexes,
		const math::XYZPoint &	bs
	)

Definition at line 60 of file DivisiveVertexFinder.cc.

                                                                   {  // output
  std::vector<PVCluster> in;
  std::pair<std::vector<PVCluster>, std::vector<const reco::Track *> > out;
 
  // Convert input track collection into container needed by Wolfgang's templated code
  // Need to save a map to reconvert from bare pointers, oy vey
  std::map<const reco::Track *, reco::TrackRef> mapa;
  //  std::vector< std::vector< const reco::Track* > > trkps;
  for (unsigned int i = 0; i < trks.size(); ++i) {
    double vz = trks[i]->vz();
    if (edm::isNotFinite(vz))
      continue;
    std::vector<const reco::Track *> temp;
    temp.clear();
    temp.push_back(&(*trks[i]));
 
    in.push_back(PVCluster(Measurement1D(trks[i]->dz(bs), trks[i]->dzError()), temp));
    mapa[temp[0]] = trks[i];
  }
 
  if (verbose_ > 0) {
    edm::LogInfo("DivisiveVertexFinder") << "size of input vector of clusters " << in.size();
    for (unsigned int i = 0; i < in.size(); ++i) {
      edm::LogInfo("DivisiveVertexFinder")
          << "Track " << i << " addr " << in[i].tracks()[0] << " dz " << in[i].tracks()[0]->dz(bs) << " +- "
          << in[i].tracks()[0]->dzError() << " prodID " << mapa[in[i].tracks()[0]].id() << " dz from RefTrack "
          << mapa[in[i].tracks()[0]]->dz(bs) << " +- " << mapa[in[i].tracks()[0]]->dzError();
    }
  }
 
  // Run the darn thing
  divmeth_.setBeamSpot(bs);
  out = divmeth_(in);
 
  if (verbose_ > 0)
    edm::LogInfo("DivisiveVertexFinder") << " DivisiveClusterizer1D found " << out.first.size() << " vertexes";
 
  // Now convert the output yet again into something we can safely store in the event
  for (unsigned int iv = 0; iv < out.first.size(); ++iv) {  // loop over output vertexes
    reco::Vertex::Error err;
    err(2, 2) = out.first[iv].position().error() * out.first[iv].position().error();
 
    reco::Vertex v(reco::Vertex::Point(0, 0, out.first[iv].position().value()), err, 0, 1, out.second.size());
    if (verbose_ > 0)
      edm::LogInfo("DivisiveVertexFinder")
          << " DivisiveClusterizer1D vertex " << iv << " has " << out.first[iv].tracks().size()
          << " tracks and a position of " << v.z() << " +- " << std::sqrt(v.covariance(2, 2));
    for (unsigned int itrk = 0; itrk < out.first[iv].tracks().size(); ++itrk) {
      v.add(reco::TrackBaseRef(mapa[out.first[iv].tracks()[itrk]]));
    }
    vertexes.push_back(v);  // Done with horrible conversion, save it
  }
 
  // Finally, sort the vertexes in decreasing sumPtSquared
  //  std::sort(vertexes.begin(), vertexes.end(), PVClusterComparer());
  std::sort(vertexes.begin(), vertexes.end(), *pvComparer_);
 
  return true;
}

References cms::cuda::bs, divmeth_, PVValHelper::dz, submitPVResolutionJobs::err, mps_fire::i, recoMuon::in, edm::isNotFinite(), MillePedeFileConverter_cfg::out, pvComparer_, pixeltemp::DivisiveClusterizer1D< T >::setBeamSpot(), edm::RefVector< C, T, F >::size(), mathSSE::sqrt(), groupFilesInBlocks::temp, findQualityFiles::v, verbose_, and jets_cff::vertexes.

Referenced by PixelVertexProducer::produce().

Member Data Documentation

divmeth_

pixeltemp::DivisiveClusterizer1D<reco::Track> DivisiveVertexFinder::divmeth_

private

We use Wolfgang's templated class that implements the actual divisive method.

Definition at line 61 of file DivisiveVertexFinder.h.

Referenced by findVertexesAlt().

ntrkMin_

int DivisiveVertexFinder::ntrkMin_

private

Definition at line 57 of file DivisiveVertexFinder.h.

pvComparer_

PVClusterComparer* DivisiveVertexFinder::pvComparer_

private

Definition at line 67 of file DivisiveVertexFinder.h.

Referenced by DivisiveVertexFinder(), and findVertexesAlt().

useError_

bool DivisiveVertexFinder::useError_

private

Definition at line 58 of file DivisiveVertexFinder.h.

verbose_

int DivisiveVertexFinder::verbose_

private

Definition at line 65 of file DivisiveVertexFinder.h.

Referenced by findVertexesAlt().

wtAverage_

bool DivisiveVertexFinder::wtAverage_

private

Definition at line 58 of file DivisiveVertexFinder.h.

Referenced by findVertexes().

zOffset_

double DivisiveVertexFinder::zOffset_

private

Cuts on vertex formation and other options.

Definition at line 56 of file DivisiveVertexFinder.h.

zSeparation_

double DivisiveVertexFinder::zSeparation_

private

Definition at line 56 of file DivisiveVertexFinder.h.