NumCpp  2.7.0
A Templatized Header Only C++ Implementation of the Python NumPy Library
count_nonzero.hpp
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1 #pragma once
29 
32 #include "NumCpp/Core/Shape.hpp"
33 #include "NumCpp/Core/Types.hpp"
34 #include "NumCpp/NdArray.hpp"
35 
36 namespace nc
37 {
38  //============================================================================
39  // Method Description:
48  template<typename dtype>
50  {
52 
53  switch (inAxis)
54  {
55  case Axis::NONE:
56  {
57  NdArray<uint32> count = { inArray.size() -
58  static_cast<uint32>(stl_algorithms::count(inArray.cbegin(), inArray.cend(), dtype{ 0 })) };
59  return count;
60  }
61  case Axis::COL:
62  {
63  Shape inShape = inArray.shape();
64 
65  NdArray<uint32> returnArray(1, inShape.rows);
66  for (uint32 row = 0; row < inShape.rows; ++row)
67  {
68  returnArray(0, row) = inShape.cols -
69  static_cast<uint32>(stl_algorithms::count(inArray.cbegin(row), inArray.cend(row), dtype{ 0 }));
70  }
71 
72  return returnArray;
73  }
74  case Axis::ROW:
75  {
76  NdArray<dtype> inArrayTranspose = inArray.transpose();
77  Shape inShapeTransposed = inArrayTranspose.shape();
78  NdArray<uint32> returnArray(1, inShapeTransposed.rows);
79  for (uint32 row = 0; row < inShapeTransposed.rows; ++row)
80  {
81  returnArray(0, row) = inShapeTransposed.cols -
82  static_cast<uint32>(stl_algorithms::count(inArrayTranspose.cbegin(row), inArrayTranspose.cend(row), dtype{ 0 }));
83  }
84 
85  return returnArray;
86  }
87  default:
88  {
89  THROW_INVALID_ARGUMENT_ERROR("Unimplemented axis type.");
90  return {}; // get rid of compiler warning
91  }
92  }
93  }
94 } // namespace nc
#define THROW_INVALID_ARGUMENT_ERROR(msg)
Definition: Error.hpp:36
#define STATIC_ASSERT_ARITHMETIC_OR_COMPLEX(dtype)
Definition: StaticAsserts.hpp:50
Holds 1D and 2D arrays, the main work horse of the NumCpp library.
Definition: NdArrayCore.hpp:72
size_type size() const noexcept
Definition: NdArrayCore.hpp:4296
const_iterator cbegin() const noexcept
Definition: NdArrayCore.hpp:1216
Shape shape() const noexcept
Definition: NdArrayCore.hpp:4283
NdArray< dtype > transpose() const
Definition: NdArrayCore.hpp:4629
const_iterator cend() const noexcept
Definition: NdArrayCore.hpp:1524
A Shape Class for NdArrays.
Definition: Core/Shape.hpp:41
uint32 rows
Definition: Core/Shape.hpp:44
uint32 cols
Definition: Core/Shape.hpp:45
std::iterator_traits< InputIt >::difference_type count(InputIt first, InputIt last, const T &value) noexcept
Definition: StlAlgorithms.hpp:115
Definition: Coordinate.hpp:45
Axis
Enum To describe an axis.
Definition: Types.hpp:46
NdArray< uint32 > count_nonzero(const NdArray< dtype > &inArray, Axis inAxis=Axis::NONE)
Definition: count_nonzero.hpp:49
std::uint32_t uint32
Definition: Types.hpp:40