test_RandomNumbers_Mseries_Gaussian.cpp

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#include "test.h"

#include "randomNumbers_Mseries.h"

//====================================================================

namespace Test_RandomNumbers_Mseries {
  const std::string test_name = "RandomNumbers.Mseries.Gaussian";

  //- test-private parameters
  namespace {
    const std::string filename_input  = "test_RandomNumbers_Mseries_Gaussian.yaml";
    const std::string filename_output = "stdout";

    class Parameters_Test_RandomNumbers : public Parameters {
     public:
      Parameters_Test_RandomNumbers()
      {
        Register_int("seed", 0);
        Register_int("number_of_samples", 0);

        Register_string("verbose_level", "NULL");

        Register_double("expected_result", 0.0);
      }
    };
  }

  //- prototype declaration
  int gaussian(void);

#ifdef USE_TESTMANAGER_AUTOREGISTER
  namespace {
    static const bool is_registered = TestManager::RegisterTest(
      test_name,
      gaussian
      );
  }
#endif

  //====================================================================
  int gaussian(void)
  {
    // ####  parameter setup  ####
    Parameters *params_test = new Parameters_Test_RandomNumbers;
    Parameters *params_all  = new Parameters;

    params_all->Register_Parameters("Test_RandomNumbers", params_test);

    ParameterManager_YAML params_manager;
    params_manager.read_params(filename_input, params_all);

    int          iseed      = params_test->get_int("seed");
    int          Nrand      = params_test->get_int("number_of_samples");
    const string str_vlevel = params_test->get_string("verbose_level");

    const bool   do_check        = params_test->is_set("expected_result");
    const double expected_result = do_check ? params_test->get_double("expected_result") : 0.0;

    Bridge::VerboseLevel vl = vout.set_verbose_level(str_vlevel);

    //- print input parameters
    vout.general(vl, "  iseed  = %d\n", iseed);
    vout.general(vl, "  Nrand  = %d\n", Nrand);
    vout.general(vl, "  vlevel = %s\n", str_vlevel.c_str());
    vout.general(vl, "\n");


    // ####  object setup  ####
    RandomNumbers *rand  = new RandomNumbers_Mseries(iseed);
    Timer         *timer = new Timer(test_name);


    // ####  Execution main part  ####
    timer->start();

    double av = 0.0;
    double vr = 0.0;

    double rn1, rn2;
    for (int i = 0; i < Nrand; ++i) {
      rand->gauss(rn1, rn2);
      av += rn1 + rn2;
      vr += rn1 * rn1 + rn2 * rn2;
      // vout.general(vl, "  %10.8f  %10.8f\n",rn1,rn2);
    }
    av = av / (2.0 * Nrand);
    vr = vr / (2.0 * Nrand) - av * av;
    vr = sqrt(vr);

    vout.general(vl, "\n");
    vout.general(vl, "Gaussian distribution:\n");
    vout.general(vl, "  number of samples = %10d\n", Nrand);
    vout.general(vl, "  average           = %10.8f\n", av);
    vout.general(vl, "  variance          = %10.8f\n", vr);
    vout.general(vl, "  variance(expect)  = %10.8f\n", 1.0 / sqrt(2.0));

    double result = vr;

    timer->report();


    // ####  tidy up  ####
    delete params_test;
    delete params_all;

    delete timer;

    delete rand;


    if (do_check) {
      return Test::verify(expected_result, result);
    } else {
      vout.detailed(vl, "check skipped: expected_result not set.\n\n");
      return EXIT_SKIP;
    }
  }
} // namespace Test_RandomNumbers