lagrangeinterpolator.h

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//
// APFEL++ 2017
//
// Author: Valerio Bertone: valerio.bertone@cern.ch
//
 
#pragma once
 
#include "apfel/interpolator.h"
 
namespace apfel
{
  class LagrangeInterpolator: public Interpolator
  {
  public:
    LagrangeInterpolator(Grid const& gr);
 
    LagrangeInterpolator(Grid                             const& gr,
                         std::vector<std::vector<double>> const& distsubgrid,
                         std::vector<double>              const& distjointgrid);
 
    double InterpolantLog(int const& beta, double const& lnx, SubGrid const& sg) const;
 
    double Interpolant(int const& beta, double const& x, SubGrid const& sg) const;
 
    double DerInterpolant(int const& beta, double const& x, SubGrid const& sg) const;
 
    double IntInterpolant(int const& beta, double const& a, double const& b, SubGrid const& sg) const;
 
    std::array<int,2> SumBounds(double const& x, SubGrid const& sg) const;
  };
}