.. _program_listing_file_src_navtk_utils_GriddedInterpolant.hpp:

Program Listing for File GriddedInterpolant.hpp
===============================================

|exhale_lsh| :ref:`Return to documentation for file <file_src_navtk_utils_GriddedInterpolant.hpp>` (``src/navtk/utils/GriddedInterpolant.hpp``)

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

.. code-block:: cpp

   #pragma once
   
   #include <navtk/tensors.hpp>
   
   namespace navtk {
   namespace utils {
   
   class GriddedInterpolant {
   private:
       struct Denominator {
           int idx;  
           int p2;   
           int m1;   
       };
   
   public:
       GriddedInterpolant(Vector x_vector, Vector y_vector, Matrix q_mat);
   
       double interpolate(double x, double y);
   
   private:
       GriddedInterpolant::Denominator get_3_point_denominators(int idx, const Vector& vec) const;
   
       Matrix big_f(const Denominator& x, const Denominator& y);
   
   private:
       Vector x_vec;            
       Vector y_vec;            
       Matrix q;                
       std::size_t num_x_elem;  
       std::size_t num_y_elem;  
       double x_spacing;        
       double y_spacing;        
       double x_width;          
       double y_width;          
       double x_max;            
       double x_min;            
       double y_max;            
       double y_min;            
   
       const Matrix A = Matrix{{1, 0, 0, 0}, {0, 0, 1, 0}, {-3, 3, -2, -1}, {2, -2, 1, 1}};
   };
   }  // namespace utils
   }  // namespace navtk