NpzFile

class numpy::NpzFile

numpy C++ class.

Example

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

// Use NpzFile
NpzFile obj;
// ... operations ...

Constructors

Signature	Location	Example
NpzFile(const std::string &filename)	NP_NPZ_UTILS.H:377

I/O

Signature	Return Type	Location	Example
void load(const std::string &filename)	void	NP_NPZ_UTILS.H:385	View

Other Methods

Signature	Return Type	Location	Example
void close()	void	NP_NPZ_UTILS.H:489	View
bool contains(const std::string &name)	bool	NP_NPZ_UTILS.H:485	View

Code Examples

The following examples are extracted from the test suite.

load (np_test_2_all.cpp:9819)

    void testBinaryIOBasic() {
      std::cout << "========= testBasicBinaryIO =======================";

      // Test 1D integer array
      auto array_1d = createInt32Array({ 5 }, 0);
      for (size_t i = 0; i < 5; ++i) {
        array_1d.setElementAt({ i }, static_cast<int32_t>(i + 1));
      }

      save(array_1d, TEMP_DIR + "test_1d.npy");
      auto loaded_1d = load<int32_t>(TEMP_DIR + "test_1d.npy");

      if (!(loaded_1d.getShape() == array_1d.getShape())) {
          std::string description = std::string("testBinaryIOBasic():") + __FILE__ + ":" + std::to_string(__LINE__) + ": !(loaded_1d.getShape() == array_1d.getShape())";
          std::cout << std::string("[FAIL] ") + description << std::endl;
          throw std::runtime_error(description);
      }
      for (size_t i = 0; i < 5; ++i) {
        if (!(loaded_1d.getElementAt({ i }) == array_1d.getElementAt({ i }))) {
            std::string description = std::string("testBinaryIOBasic():") + __FILE__ + ":" + std::to_string(__LINE__) + ": !(loaded_1d.getElementAt({ i }) == array_1d.getElementAt({ i }))";
            std::cout << std::string("[FAIL] ") + description << std::endl;

close (np_test_1_all.cpp:26157)

    void np_test_recarray_fromfile() {
      std::cout << "========= fromfile: create RecordArray from file =======================";

      // Create temporary test file
      std::string filename = "D:/Projects/Cpp2/temp/test_recarray.csv";
      std::ofstream outfile(filename);
      outfile << "1,10.5\n";
      outfile << "2,20.5\n";
      outfile << "3,30.5\n";
      outfile.close();

      // Define dtype
      std::vector<std::pair<std::string, numpy::DType>> fields = {
          {"id", numpy::DType::INT32},
          {"value", numpy::DType::FLOAT64}
      };
      auto dtype = std::make_shared<numpy::StructuredDType>(fields);

      // Load from file
      auto result = numpy::fromfile(filename, dtype, ",");

contains (np_test_2_all.cpp:10521)

      auto npz_file = load_npz(TEMP_DIR + "test_multiple.npz");

      // Verify keys
      auto keys = npz_file.keys();
      if (!(keys.size() == 3)) {
          std::string description = std::string("testNPZOperations():") + __FILE__ + ":" + std::to_string(__LINE__) + ": !(keys.size() == 3)";
          std::cout << std::string("[FAIL] ") + description << std::endl;
          throw std::runtime_error(description);
      }
      if (!(npz_file.contains("integers"))) {
          std::string description = std::string("testNPZOperations():") + __FILE__ + ":" + std::to_string(__LINE__) + ": !(npz_file.contains(\"integers\"))";
          std::cout << std::string("[FAIL] ") + description << std::endl;
          throw std::runtime_error(description);
      }
      if (!(npz_file.contains("floats"))) {
          std::string description = std::string("testNPZOperations():") + __FILE__ + ":" + std::to_string(__LINE__) + ": !(npz_file.contains(\"floats\"))";
          std::cout << std::string("[FAIL] ") + description << std::endl;
          throw std::runtime_error(description);
      }
      if (!(npz_file.contains("complex_nums"))) {