.. _program_listing_file_numerics_interpolation.h:

Program Listing for File interpolation.h
========================================

|exhale_lsh| :ref:`Return to documentation for file <file_numerics_interpolation.h>` (``numerics/interpolation.h``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #include <iostream>
   #include <vector>
   
   #include "lupnt/core/constants.h"
   
   namespace lupnt {
   
     double LinearInterp1d(const VecXd& x, const VecXd& z, double ix);
   
     double LinearInterp2d(const VecXd& x, const VecXd& y, const MatXd& z, double ix, double iy);
   
     class LagrangeInterpolator {
     public:
       LagrangeInterpolator(const VecXd& x, double xi, int order);
   
       double Interpolate(const VecXd& z);
   
     private:
       VecXd x_;
       double xi_;
       int order_;
       VecXd weights_;
       int i0_;
   
       void ComputeFirstIndex();
   
       void ComputeWeights();
     };
   
   }  // namespace lupnt