NumCpp  2.11.0
A Templatized Header Only C++ Implementation of the Python NumPy Library
simpson.hpp
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1 #pragma once
33 
34 #include <functional>
35 
36 #include "NumCpp/Core/Types.hpp"
37 
38 namespace nc::integrate
39 {
40  //============================================================================
41  // Method Description:
51  inline double
52  simpson(const double low, const double high, const uint32 n, const std::function<double(double)>& f) noexcept
53  {
54  const double width = (high - low) / static_cast<double>(n);
55 
56  double simpson_integral = 0.;
57  for (uint32 step = 0; step < n; ++step)
58  {
59  const double x1 = low + static_cast<double>(step) * width;
60  const double x2 = low + static_cast<double>(step + 1) * width;
61 
62  simpson_integral += (x2 - x1) / 6. * (f(x1) + 4. * f(0.5 * (x1 + x2)) + f(x2));
63  }
64 
65  return simpson_integral;
66  }
67 } // namespace nc::integrate
Definition: gauss_legendre.hpp:43
double simpson(const double low, const double high, const uint32 n, const std::function< double(double)> &f) noexcept
Definition: simpson.hpp:52
dtype f(GeneratorType &generator, dtype inDofN, dtype inDofD)
Definition: f.hpp:56
std::uint32_t uint32
Definition: Types.hpp:40