ROCCurve.h

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// --------------------------------------------------------------------------
//                   OpenMS -- Open-Source Mass Spectrometry
// --------------------------------------------------------------------------
// Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
// ETH Zurich, and Freie Universitaet Berlin 2002-2022.
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// $Maintainer: Timo Sachsenberg $
// $Authors: $
// --------------------------------------------------------------------------

#pragma once

#include <OpenMS/config.h>
#include <OpenMS/CONCEPT/Types.h>

#include <list>
#include <vector>

namespace OpenMS
{
  namespace Math
  {
    class OPENMS_DLLAPI ROCCurve
    {
public:

      // @name Constructors and Destructors
      // @{
      ROCCurve();

      explicit ROCCurve(const std::vector<std::pair<double,bool>> & pairs);

      virtual ~ROCCurve() = default;

      ROCCurve(const ROCCurve & source);
      // @}

      // @name Operators
      // @{
      ROCCurve & operator=(const ROCCurve & source);
      // @}

      // @name Accessors
      // @{
      void insertPair(double score, bool clas);

      double AUC();

      double rocN(Size N);

      std::vector<std::pair<double, double> > curve(UInt resolution = 10);

      double cutoffPos(double fraction = 0.95);

      double cutoffNeg(double fraction = 0.95);

      // @}

private:
      inline void sort();

      inline void count();

      inline double trapezoidal_area(double x1, double x2, double y1, double y2);

      class OPENMS_DLLAPI simsortdec
      {
public:

        bool operator()(const std::pair<double, bool> & a, const std::pair<double, bool> & b)
        {
          return b.first < a.first;
        }

      };


      std::vector<std::pair<double, bool> > score_clas_pairs_;

      UInt pos_;

      UInt neg_;

      bool sorted_;
    };
  }
}