/data/refman/pasoursint/CMSSW_6_1_2_SLHC4_patch1/src/PhysicsTools/MVAComputer/interface/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
// $Id: Spline.h,v 1.5 2009/06/03 09:50:14 saout Exp $
//

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