NumCpp  2.9.0
A Templatized Header Only C++ Implementation of the Python NumPy Library
nanmedian.hpp
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1 #pragma once
29 
30 #include <cmath>
31 #include <vector>
32 
36 #include "NumCpp/Core/Shape.hpp"
37 #include "NumCpp/Core/Types.hpp"
38 #include "NumCpp/Functions/max.hpp"
39 #include "NumCpp/NdArray.hpp"
40 
41 namespace nc
42 {
43  //============================================================================
44  // Method Description:
54  template<typename dtype>
56  {
57  STATIC_ASSERT_FLOAT(dtype);
58 
59  switch (inAxis)
60  {
61  case Axis::NONE:
62  {
63  std::vector<dtype> values;
64  for (auto value : inArray)
65  {
66  if (!std::isnan(value))
67  {
68  values.push_back(value);
69  }
70  }
71 
72  const uint32 middle = static_cast<uint32>(values.size()) / 2;
73  stl_algorithms::nth_element(values.begin(), values.begin() + middle, values.end());
74  NdArray<dtype> returnArray = { values[middle] };
75 
76  return returnArray;
77  }
78  case Axis::COL:
79  {
80  const Shape inShape = inArray.shape();
81  NdArray<dtype> returnArray(1, inShape.rows);
82  for (uint32 row = 0; row < inShape.rows; ++row)
83  {
84  std::vector<dtype> values;
85  for (uint32 col = 0; col < inShape.cols; ++col)
86  {
87  if (!std::isnan(inArray(row, col)))
88  {
89  values.push_back(inArray(row, col));
90  }
91  }
92 
93  const uint32 middle = static_cast<uint32>(values.size()) / 2;
94  stl_algorithms::nth_element(values.begin(), values.begin() + middle, values.end());
95  returnArray(0, row) = values[middle];
96  }
97 
98  return returnArray;
99  }
100  case Axis::ROW:
101  {
102  return nanmedian(inArray.transpose(), Axis::COL);
103  }
104  default:
105  {
106  THROW_INVALID_ARGUMENT_ERROR("Unimplemented axis type.");
107  return {}; // get rid of compiler warning
108  }
109  }
110  }
111 } // namespace nc
#define THROW_INVALID_ARGUMENT_ERROR(msg)
Definition: Error.hpp:36
#define STATIC_ASSERT_FLOAT(dtype)
Definition: StaticAsserts.hpp:45
Holds 1D and 2D arrays, the main work horse of the NumCpp library.
Definition: NdArrayCore.hpp:72
Shape shape() const noexcept
Definition: NdArrayCore.hpp:4092
NdArray< dtype > transpose() const
Definition: NdArrayCore.hpp:4457
A Shape Class for NdArrays.
Definition: Core/Shape.hpp:41
uint32 rows
Definition: Core/Shape.hpp:44
uint32 cols
Definition: Core/Shape.hpp:45
void nth_element(RandomIt first, RandomIt nth, RandomIt last) noexcept
Definition: StlAlgorithms.hpp:428
Definition: Coordinate.hpp:45
Axis
Enum To describe an axis.
Definition: Types.hpp:47
NdArray< dtype > nanmedian(const NdArray< dtype > &inArray, Axis inAxis=Axis::NONE)
Definition: nanmedian.hpp:55
bool isnan(dtype inValue) noexcept
Definition: isnan.hpp:49
std::uint32_t uint32
Definition: Types.hpp:40