/data/refman/pasoursint/CMSSW_4_2_9_HLT1_bphpatch4/src/TrackingTools/GsfTools/interface/GaussianSumUtilities1D.h

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#ifndef GaussianSumUtilities1D_h_
#define GaussianSumUtilities1D_h_

// #include "TROOT.h"

#include "TrackingTools/GsfTools/interface/SingleGaussianState1D.h"
#include "TrackingTools/GsfTools/interface/MultiGaussianState1D.h"

#include <vector>

class GaussianSumUtilities1D {
private:
  enum ModeStatus { Valid, NotValid, NotComputed };

public:
  GaussianSumUtilities1D (const MultiGaussianState1D& state) :
    theState(state),
//     theStates(state.components()),
    theModeStatus(NotComputed) {} 
  ~GaussianSumUtilities1D () {}

  inline unsigned int size () const {return components().size();}
  inline const std::vector<SingleGaussianState1D>& components () const {
    return theState.components();
  }
  inline double weight (unsigned int i) const {return components()[i].weight();}
  inline double mean (unsigned int i) const {return components()[i].mean();}
  inline double standardDeviation (unsigned int i) const {
//     return sqrt(components()[i].variance());
    return components()[i].standardDeviation();
  }
  inline double variance (unsigned int i) const {return components()[i].variance();}
  double pdf(unsigned int i, double x)  const;
  double quantile (const double) const;
  bool modeIsValid () const;
  const SingleGaussianState1D& mode () const;
  double pdf (double) const;
  double cdf (const double&) const;
  double d1Pdf (const double&) const;
  double d2Pdf (const double&) const;
  double d3Pdf (const double&) const;
  double lnPdf (const double&) const;
  double d1LnPdf (const double&) const;
  double d2LnPdf (const double&) const;

  double weight () const {
    return theState.weight();
  }
  double mean () const {
    return theState.mean();
  }
  double variance () const {
    return theState.variance();
  }

private:
  bool findMode (double& mode, double& pdfAtMode, 
                 const double& xStart, const double& scale) const;
  static double gauss (double, double, double);
  static double gaussInt (double, double, double);
  double combinedMean() const;
  void computeMode () const;
  double localVariance (double x) const;

  // the state of the mode finder
  struct FinderState {
    FinderState(){}
    FinderState(size_t n): pdfs(n){}
    double x;
    double y;
    double yd; // d1LnPdf
    double yd2; // d2LnPdf
    std::vector<double> pdfs;
  };

  // update tre state at x
  void update(FinderState & state, double x) const;

  std::vector<double> pdfComponents (const double&) const;
  void pdfComponents (double, std::vector<double> & ) const;
  static double pdf (double, const std::vector<double>&);
  double d1Pdf (double, const std::vector<double>&) const;
  double d2Pdf (double, const std::vector<double>&) const;
  double d3Pdf (double, const std::vector<double>&) const;
  static double lnPdf (double, const std::vector<double>&);
  double d1LnPdf (double, const std::vector<double>&) const;
  double d2LnPdf (double, const std::vector<double>&) const;

private:
  const MultiGaussianState1D& theState;
//   std::vector<SingleGaussianState1D> theStates;

  mutable ModeStatus theModeStatus;
  mutable SingleGaussianState1D theMode;
//   mutable double theMode;
};
#endif