StyleSubset
===========

.. cpp:class:: numpy::StyleSubset

   numpy C++ class.

Example
-------

.. code-block:: cpp

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

   // Use StyleSubset
   StyleSubset obj;
   // ... operations ...

Constructors
------------

.. list-table::
   :widths: 55 25 20
   :header-rows: 1

   * - Signature
     - Location
     - Example
   * - ``StyleSubset() = default``
     - df_styler.h:47
     - 
   * - ``StyleSubset(const std::vector<std::string>& cols, const std::vector<size_t>& r)``
     - df_styler.h:50
     - 

Other Methods
-------------

.. list-table::
   :widths: 40 20 15 25
   :header-rows: 1

   * - Signature
     - Return Type
     - Location
     - Example
   * - ``StyleSubset(const std::vector<std::string>& cols) : columns(cols)``
     - StyleSubset(const std::vector<std::string>& cols) :
     - df_styler.h:48
     - :ref:`View <example-stylesubset-columns-0>`
   * - ``StyleSubset(const std::vector<size_t>& r) : rows(r)``
     - StyleSubset(const std::vector<size_t>& r) :
     - df_styler.h:49
     - :ref:`View <example-stylesubset-rows-1>`


Code Examples
-------------

The following examples are extracted from the test suite.

.. _example-stylesubset-columns-0:

.. dropdown:: columns (np_test_4_all.cpp:22531)
   :class-title: example-dropdown

   .. code-block:: cpp
      :linenos:
      :lineno-start: 22521
      :emphasize-lines: 11

          mask.setElementAt({1, 3}, false);
      
          mask.setElementAt({2, 0}, false);
          mask.setElementAt({2, 1}, true);
          mask.setElementAt({2, 2}, true);
          mask.setElementAt({2, 3}, false);
      
          MaskedArray<int> marr(data, mask);
          auto result = numpy::ma::compress_nd(marr, 1);
      
          // Should have 2 columns (columns 0 and 3)
          if (!(result.data().getShape().size() == 2)) {
              std::string description = std::string("test_compress_nd_2d_axis1():") + __FILE__ + ":" + std::to_string(__LINE__) + ": !(result.data().getShape().size() == 2)";
              std::cout << std::string("[FAIL] ") + description << std::endl;
              throw std::runtime_error(description);
          }
          if (!(result.data().getShape()[0] == 3)) {
              std::string description = std::string("test_compress_nd_2d_axis1():") + __FILE__ + ":" + std::to_string(__LINE__) + ": !(result.data().getShape()[0] == 3)";
              std::cout << std::string("[FAIL] ") + description << std::endl;
              throw std::runtime_error(description);
          }

.. _example-stylesubset-rows-1:

.. dropdown:: rows (np_test_2_all.cpp:4910)
   :class-title: example-dropdown

   .. code-block:: cpp
      :linenos:
      :lineno-start: 4900
      :emphasize-lines: 11

        namespace test_matrix {
      
          /**
           * Test basic matrix construction and properties
           */
          void testMatrixBasics() {
            std::cout << "========= testMatrixBasics =======================";
      
            // Test construction from dimensions
            numpy::Matrix<double> m1(3, 3);
            assert_test(m1.rows() == 3, "Matrix rows");
            assert_test(m1.cols() == 3, "Matrix cols");
            assert_test(m1.isSquare(), "Matrix is square");
      
            // Test construction from 2D vector
            std::vector<std::vector<int>> data = { {1, 2, 3}, {4, 5, 6} };
            numpy::Matrix<int> m2(data);
            assert_test(m2.rows() == 2, "Matrix from vector rows");
            assert_test(m2.cols() == 3, "Matrix from vector cols");
            assert_test(m2(0, 0) == 1, "Matrix element access");
            assert_test(m2(1, 2) == 6, "Matrix element access");