FloatingDtype

class numpy::FloatingDtype

numpy C++ class.

Example

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

// Use FloatingDtype
FloatingDtype obj;
// ... operations ...

Constructors

Signature	Location	Example
FloatingDtype() = default	df_floating_dtype.h:31

Indexing / Selection

Signature	Return Type	Location	Example
size_t itemsize() const override	size_t	df_floating_dtype.h:53	View

Statistics

Signature	Return Type	Location	Example
T max_value() const	T	df_floating_dtype.h:82
T min_value() const	T	df_floating_dtype.h:75

Type Checking

Signature	Return Type	Location	Example
static bool is_finite(T value)	static bool	df_floating_dtype.h:96
static bool is_inf(T value)	static bool	df_floating_dtype.h:110
static bool is_nan(T value)	static bool	df_floating_dtype.h:103

Other Methods

Signature	Return Type	Location	Example
T epsilon() const	T	df_floating_dtype.h:89	View
std::string kind() const override	std::string	df_floating_dtype.h:61
bool matches(const std::string& dtype_name) const	bool	df_floating_dtype.h:119	View
std::string name() const override	std::string	df_floating_dtype.h:38	View
numpy::DType numpy_dtype() const override	numpy::DType	df_floating_dtype.h:46
const std::type_info& type() const override	const std::type_info&	df_floating_dtype.h:68	View

Code Examples

The following examples are extracted from the test suite.

itemsize (np_test_2_all.cpp:3540)

      }

      // Test size
      if (!(size(arr) == 24)) {
          std::string description = std::string("testArrayInfo():") + __FILE__ + ":" + std::to_string(__LINE__) + ": !(size(arr) == 24)";
          std::cout << std::string("[FAIL] ") + description << std::endl;
          throw std::runtime_error(description);
      }

      // Test itemsize
      if (!(itemsize(arr) == sizeof(double))) {
          std::string description = std::string("testArrayInfo():") + __FILE__ + ":" + std::to_string(__LINE__) + ": !(itemsize(arr) == sizeof(double))";
          std::cout << std::string("[FAIL] ") + description << std::endl;
          throw std::runtime_error(description);
      }

      // Test nbytes
      if (!(nbytes(arr) == 24 * sizeof(double))) {
          std::string description = std::string("testArrayInfo():") + __FILE__ + ":" + std::to_string(__LINE__) + ": !(nbytes(arr) == 24 * sizeof(double))";
          std::cout << std::string("[FAIL] ") + description << std::endl;
          throw std::runtime_error(description);

epsilon (np_test_1_all.cpp:7822)

    // std::cout << "  float16: " << sizeof(float16) << " bytes" << std::endl;
    // std::cout << "  float32: " << sizeof(float32) << " bytes" << std::endl;
    // std::cout << "  float64: " << sizeof(float64) << " bytes" << std::endl;
    // std::cout << "  float128: " << sizeof(float128) << " bytes" << std::endl;

    // Test numeric limits
    // std::cout << "Numeric limits:" << std::endl;
    // std::cout << "  min: " << std::numeric_limits<float16>::min() << std::endl;
    // std::cout << "  max: " << std::numeric_limits<float16>::max() << std::endl;
    // std::cout << "  lowest: " << std::numeric_limits<float16>::lowest() << std::endl;
    // std::cout << "  epsilon: " << std::numeric_limits<float16>::epsilon() << std::endl;
    // std::cout << "  digits: " << std::numeric_limits<float16>::digits << std::endl;
    // std::cout << "  digits10: " << std::numeric_limits<float16>::digits10 << std::endl;

    std::cout << " -> tests passed" << std::endl;
}

void testFloat16BitPatternsFloat16() {
    std::cout << "========= testFloat16BitPatternsFloat16 =======================";

    // Test some known bit patterns

matches (np_test_1_all.cpp:26699)

            std::cout << std::string("[FAIL] ") + description << std::endl;
            throw std::runtime_error(description);
        }
        // std::cout << "  ✓ load_library() (stub)" << std::endl;
      }

      // Test ndpointer
      {
        auto ptr_desc = numpy::ctypeslib::ndpointer<double>(2, { 10, 10 });
        auto arr = NDArray<double>({ 10, 10 }, 0.0);
        bool matches = ptr_desc.matches(arr);
        if (!(matches)) {
            std::string description = std::string("test_ctypes_interop():") + __FILE__ + ":" + std::to_string(__LINE__) + ": !(matches)";
            std::cout << std::string("[FAIL] ") + description << std::endl;
            throw std::runtime_error(description);
        }
        // std::cout << "  ✓ ndpointer()" << std::endl;
      }

      // std::cout << "  [PASS] Sub-phase 6D complete (4 functions tested)" << std::endl;
    }

name (np_test_1_all.cpp:24865)

      uint64_t before_restore = rng.next_uint64();
      rng.set_state(state);
      uint64_t after_restore = rng.next_uint64();

      if (before_restore != after_restore) {
        std::cout << "  [FAIL] : in np_test_bitgen_mt19937() : state restore failed";
        throw std::runtime_error("np_test_bitgen_mt19937 failed: state");
      }

      // Test name
      if (rng.name() != "MT19937") {
        std::cout << "  [FAIL] : in np_test_bitgen_mt19937() : incorrect name";
        throw std::runtime_error("np_test_bitgen_mt19937 failed: name");
      }

      std::cout << " -> tests passed" << std::endl;
    }

    // ============================================================================
    // PCG64 TESTS
    // ============================================================================

type (np_test_1_all.cpp:2240)

        std::string description = std::string("testArrayEdgeCases():") + __FILE__ + ":" + std::to_string(__LINE__) + ": !(multi_array.getElementAt({0, 1}).is_type<std::string>())";
        std::cout << std::string("[FAIL] ") + description << std::endl;
        throw std::runtime_error(description);
    }
    if (!(multi_array.getElementAt({0, 2}).is_type<double>())) {
        std::string description = std::string("testArrayEdgeCases():") + __FILE__ + ":" + std::to_string(__LINE__) + ": !(multi_array.getElementAt({0, 2}).is_type<double>())";
        std::cout << std::string("[FAIL] ") + description << std::endl;
        throw std::runtime_error(description);
    }

    // Test 4: Arrays with all same type (homogeneous)
    NDArray<object_> homo_array = createObjectZeros({5});
    for (size_t i = 0; i < 5; ++i) {
        homo_array.setElementAt({i}, object_(static_cast<int>(i * 10)));
    }

    // Verify all are same type
    for (size_t i = 0; i < 5; ++i) {
        object_ obj = homo_array.getElementAt({i});
        if (!(obj.is_type<int>())) {
            std::string description = std::string("testArrayEdgeCases():") + __FILE__ + ":" + std::to_string(__LINE__) + ": !(obj.is_type<int>())";