CubicSpline2d.h

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//                   OpenMS -- Open-Source Mass Spectrometry
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// Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
// ETH Zurich, and Freie Universitaet Berlin 2002-2018.
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// $Maintainer: Lars Nilse $
// $Authors: Lars Nilse $
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#pragma once

#include <OpenMS/OpenMSConfig.h>

#include <vector>
#include <map>

namespace OpenMS
{
  class OPENMS_DLLAPI CubicSpline2d
  {

    std::vector<double> a_; // constant spline coefficients
    std::vector<double> b_; // linear spline coefficients
    std::vector<double> c_; // quadratic spline coefficients
    std::vector<double> d_; // cubic spline coefficients
    std::vector<double> x_; // knots

public:

    CubicSpline2d(const std::vector<double>& x, const std::vector<double>& y);

    CubicSpline2d(const std::map<double, double>& m);

    double eval(double x) const;

    double derivatives(double x, unsigned order) const;

private:

    void init_(const std::vector<double>& x, const std::vector<double>& y);

  };

}