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);

    double eval(double x) const;

    double deriv(double x) const;

    double integral(double x) const;

    double getArea() const { return area; }

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

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

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

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

} // namespace PhysicsTools

#endif // PhysicsTools_MVAComputer_Spline_h