TruncatedAverageDeDxEstimator.h

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#ifndef RecoTrackerDeDx_TruncatedAverageDeDxEstimator_h
#define RecoTrackerDeDx_TruncatedAverageDeDxEstimator_h

#include "RecoTracker/DeDx/interface/BaseDeDxEstimator.h"
#include "RecoTracker/DeDx/interface/DeDxTools.h"
#include "DataFormats/TrackReco/interface/DeDxHit.h"
#include <numeric>

class TruncatedAverageDeDxEstimator : public BaseDeDxEstimator {
public:
  TruncatedAverageDeDxEstimator(const edm::ParameterSet& iConfig) {
    fraction_ = iConfig.getParameter<double>("fraction");
  }

  std::pair<float, float> dedx(const reco::DeDxHitCollection& Hits) override {
    int nTrunc = int(Hits.size() * fraction_);
    double sumdedx = 0;
    for (size_t i = 0; i + nTrunc < Hits.size(); i++) {
      sumdedx += Hits[i].charge();
    }
    double avrdedx = (Hits.size()) ? sumdedx / (Hits.size() - nTrunc) : 0.0;
    return std::make_pair(avrdedx, -1);
  }

private:
  float fraction_;
};

#endif