Spline.h

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#ifndef PhysicsTools_MVAComputer_Spline_h
#define PhysicsTools_MVAComputer_Spline_h
// -*- C++ -*-
//
// Package:     MVAComputer
// Class  :     Spline
//

//
// Author:  Christophe Saout <christophe.saout@cern.ch>
// Created:     Sat Apr 24 15:18 CEST 2007
//

namespace PhysicsTools {

  class Spline {
  public:
    Spline();
    Spline(const Spline &orig);

    Spline(unsigned int n, const double *vals);
    ~Spline();

    Spline &operator=(const Spline &orig);

    void set(unsigned int n, const double *vals);

    float eval(float x) const;

    float deriv(float x) const;

    float integral(float x) const;

    float getArea() const { return area; }

    inline unsigned int numberOfEntries() const { return n + 1; }

  private:
    struct Segment {
      float coeffs[4];
      float area;

      float eval(float x) const;
      float deriv(float x) const;
      float integral(float x) const;
    };

    unsigned int n;
    Segment *segments;
    float area;
  };

}  // namespace PhysicsTools

#endif  // PhysicsTools_MVAComputer_Spline_h