fsfw/contrib/fsfw_contrib/etl-20.39.4/test/test_covariance.cpp

/******************************************************************************
The MIT License(MIT)

Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com

Copyright(c) 2021 John Wellbelove

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#include "unit_test_framework.h"

#include "etl/covariance.h"

#include <array>

namespace
{
  std::array<char, 10> input_c
  {
    0, 1, 2, 3, 4, 5, 6, 7, 8, 9
  };

  std::array<char, 10> input_c_flat
  {
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  };

  std::array<char, 10> input_c_inv
  {
    0, -1, -2, -3, -4, -5, -6, -7, -8, -9
  };

  //*********************************
  std::array<float, 10> input_f
  {
    0.0f, 1.0f, 2.0f, 3.0f, 4.0f, 5.0f, 6.0f, 7.0f, 8.0f, 9.0f
  };

  std::array<float, 10> input_f_flat
  {
    0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f
  };

  std::array<float, 10> input_f_inv
  {
    0.0f, -1.0f, -2.0f, -3.0f, -4.0f, -5.0f, -6.0f, -7.0f, -8.0f, -9.0f
  };

  //*********************************
  std::array<double, 10> input_d
  {
    0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0
  };

  std::array<double, 10> input_d_flat
  {
    0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0
  };

  std::array<double, 10> input_d_inv
  {
    0.0, -1.0, -2.0, -3.0, -4.0, -5.0, -6.0, -7.0, -8.0, -9.0
  };

  SUITE(test_covariance)
  {
    //*************************************************************************
    TEST(test_char_covariance_default_constructor)
    {
      etl::covariance<etl::covariance_type::Population, char, int32_t> covariance;

      double covariance_result = covariance;

      CHECK_EQUAL(0.0, covariance_result);
    }

    //*************************************************************************
    TEST(test_float_covariance_default_constructor)
    {
      etl::covariance<etl::covariance_type::Population, float> covariance;

      double covariance_result = covariance;

      CHECK_EQUAL(0.0, covariance_result);
    }

    //*************************************************************************
    TEST(test_double_covariance_default_constructor)
    {
      etl::covariance<etl::covariance_type::Population, double> covariance;

      double covariance_result = covariance;

      CHECK_EQUAL(0.0, covariance_result);
    }

    //*************************************************************************
    TEST(test_char_covariance_constructor_population)
    {
      double covariance_result;

      // Negative covariance.
      etl::covariance<etl::covariance_type::Population, char, int32_t> covariance1(input_c.begin(), input_c.end(), input_c_inv.begin());
      covariance_result = covariance1.get_covariance();
      CHECK_CLOSE(-8.25, covariance_result, 0.1);

      // Zero covariance
      etl::covariance<etl::covariance_type::Population, char, int32_t> covariance2(input_c.begin(), input_c.end(), input_c_flat.begin());
      covariance_result = covariance2.get_covariance();
      CHECK_CLOSE(0.0, covariance_result, 0.1);

      // Positive covariance.
      etl::covariance<etl::covariance_type::Population, char, int32_t> covariance3(input_c.begin(), input_c.end(), input_c.begin());
      covariance_result = covariance3.get_covariance();
      CHECK_CLOSE(8.25, covariance_result, 0.1);
    }

    //*************************************************************************
    TEST(test_char_covariance_constructor_sample)
    {
      double covariance_result;

      // Negative covariance.
      etl::covariance<etl::covariance_type::Sample, char, int32_t> covariance1(input_c.begin(), input_c.end(), input_c_inv.begin());
      covariance_result = covariance1.get_covariance();
      CHECK_CLOSE(-9.17, covariance_result, 0.1);

      // Zero covariance
      etl::covariance<etl::covariance_type::Sample, char, int32_t> covariance2(input_c.begin(), input_c.end(), input_c_flat.begin());
      covariance_result = covariance2.get_covariance();
      CHECK_CLOSE(0.0, covariance_result, 0.1);

      // Positive covariance.
      etl::covariance<etl::covariance_type::Sample, char, int32_t> covariance3(input_c.begin(), input_c.end(), input_c.begin());
      covariance_result = covariance3.get_covariance();
      CHECK_CLOSE(9.17, covariance_result, 0.1);
    }

    //*************************************************************************
    TEST(test_float_covariance_constructor_population)
    {
      double covariance_result;

      // Negative covariance.
      etl::covariance<etl::covariance_type::Population, float> covariance1(input_f.begin(), input_f.end(), input_f_inv.begin());
      covariance_result = covariance1.get_covariance();
      CHECK_CLOSE(-8.25, covariance_result, 0.1);

      // Zero covariance
      etl::covariance<etl::covariance_type::Population, float> covariance2(input_f.begin(), input_f.end(), input_f_flat.begin());
      covariance_result = covariance2.get_covariance();
      CHECK_CLOSE(0.0, covariance_result, 0.1);

      // Positive covariance.
      etl::covariance<etl::covariance_type::Population, float> covariance3(input_f.begin(), input_f.end(), input_f.begin());
      covariance_result = covariance3.get_covariance();
      CHECK_CLOSE(8.25, covariance_result, 0.1);
    }

    //*************************************************************************
    TEST(test_float_covariance_constructor_sample)
    {
      double covariance_result;

      // Negative covariance.
      etl::covariance<etl::covariance_type::Sample, float> covariance1(input_f.begin(), input_f.end(), input_f_inv.begin());
      covariance_result = covariance1.get_covariance();
      CHECK_CLOSE(-9.17, covariance_result, 0.1);

      // Zero covariance
      etl::covariance<etl::covariance_type::Sample, float> covariance2(input_f.begin(), input_f.end(), input_f_flat.begin());
      covariance_result = covariance2.get_covariance();
      CHECK_CLOSE(0.0, covariance_result, 0.1);

      // Positive covariance.
      etl::covariance<etl::covariance_type::Sample, float> covariance3(input_f.begin(), input_f.end(), input_f.begin());
      covariance_result = covariance3.get_covariance();
      CHECK_CLOSE(9.17, covariance_result, 0.1);
    }

    //*************************************************************************
    TEST(test_double_covariance_constructor_population)
    {
      double covariance_result;

      // Negative covariance.
      etl::covariance<etl::covariance_type::Population, double> covariance1(input_d.begin(), input_d.end(), input_d_inv.begin());
      covariance_result = covariance1.get_covariance();
      CHECK_CLOSE(-8.25, covariance_result, 0.1);

      // Zero covariance
      etl::covariance<etl::covariance_type::Population, double> covariance2(input_d.begin(), input_d.end(), input_d_flat.begin());
      covariance_result = covariance2.get_covariance();
      CHECK_CLOSE(0.0, covariance_result, 0.1);

      // Positive covariance.
      etl::covariance<etl::covariance_type::Population, double> covariance3(input_d.begin(), input_d.end(), input_d.begin());
      covariance_result = covariance3.get_covariance();
      CHECK_CLOSE(8.25, covariance_result, 0.1);
    }

    //*************************************************************************
    TEST(test_double_covariance_constructor_sample)
    {
      double covariance_result;

      // Negative covariance.
      etl::covariance<etl::covariance_type::Sample, double> covariance1(input_d.begin(), input_d.end(), input_d_inv.begin());
      covariance_result = covariance1.get_covariance();
      CHECK_CLOSE(-9.17, covariance_result, 0.1);

      // Zero covariance
      etl::covariance<etl::covariance_type::Sample, double> covariance2(input_d.begin(), input_d.end(), input_d_flat.begin());
      covariance_result = covariance2.get_covariance();
      CHECK_CLOSE(0.0, covariance_result, 0.1);

      // Positive covariance.
      etl::covariance<etl::covariance_type::Sample, double> covariance3(input_d.begin(), input_d.end(), input_d.begin());
      covariance_result = covariance3.get_covariance();
      CHECK_CLOSE(9.17, covariance_result, 0.1);
    }
  };
}