Generator

class numpy::Generator

Random number generation class.

Example

#include <numpy/np_ndarray.h>
using namespace numpy;

// Create random generator
Generator gen(12345);  // seed

// Generate random values
auto uniform = gen.random({3, 3});
auto normal = gen.standard_normal({10});
auto integers = gen.integers(0, 100, {5});

Constructors

Signature	Location	Example
Generator(std::unique_ptr<BitGenerator>bg)	NP_BITGEN.H:662	View

Random

Signature	Return Type	Location	Example
void seed(uint64_ts)	void	NP_BITGEN.H:778	View

Other Methods

Signature	Return Type	Location	Example
BitGenerator & bit_generator()	BitGenerator &	NP_BITGEN.H:668
void set_state(const std::vector<uint64_t>&state)	void	NP_BITGEN.H:771	View

Code Examples

The following examples are extracted from the test suite.

Generator (np_test_1_all.cpp:25085)

    }

    // ============================================================================
    // GENERATOR TESTS
    // ============================================================================

    void np_test_bitgen_generator() {
      std::cout << "========= Generator API =======================";

      // Test with PCG64
      auto rng = numpy::random::Generator(
        std::make_unique<numpy::random::PCG64>(54321)
      );

      // Test uniform
      auto arr_uniform = rng.uniform<double>(0.0, 1.0, { 10 });
      if (arr_uniform.getSize() != 10) {
        std::cout << "  [FAIL] : in np_test_bitgen_generator() : uniform size";
        throw std::runtime_error("np_test_bitgen_generator failed");
      }

seed (np_test_1_all.cpp:14339)

    }
    // std::cout << "[OK] Generator integers method\n";

    std::cout << " -> tests passed\n";
  }

  void test_vsl_reproducibility() {
    std::cout << "========= test_vsl_reproducibility ====";

    // Test seed reproducibility
    seed(42);
    auto arr1 = normal<double>(0.0, 1.0, { {10} });

    seed(42);
    auto arr2 = normal<double>(0.0, 1.0, { {10} });



    for (size_t i = 0; i < 10; ++i) {
      double val1 = arr1.getElementAt({ i });
      double val2 = arr2.getElementAt({ i });

set_state (np_test_1_all.cpp:22363)

    }
    // std::cout << "[OK] Random bytes\n";

    // Test state functions
    std::string state = get_state();
    if (!(!state.empty())) {
        std::string description = std::string("testRandomUtilityFunctions():") + __FILE__ + ":" + std::to_string(__LINE__) + ": !(!state.empty())";
        std::cout << std::string("[FAIL] ") + description << std::endl;
        throw std::runtime_error(description);
    }
    set_state(12345);
    // std::cout << "[OK] State functions\n";

    std::cout << " -> tests passed\n";
  }

  void testGeneratorAPI() {
    std::cout << "========= testGeneratorAPI ====";

    // Test modern Generator API
    auto gen = create_generator(42);