NumCpp  2.11.0
A Templatized Header Only C++ Implementation of the Python NumPy Library
rand.hpp
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1 #pragma once
30 
31 #include <algorithm>
32 #include <random>
33 
35 #include "NumCpp/Core/Shape.hpp"
36 #include "NumCpp/NdArray.hpp"
38 
39 namespace nc::random
40 {
41  namespace detail
42  {
43  //============================================================================
44  // Method Description:
53  template<typename dtype, typename GeneratorType = std::mt19937>
54  dtype rand(GeneratorType& generator)
55  {
56  STATIC_ASSERT_FLOAT(dtype);
57 
58  std::uniform_real_distribution<dtype> dist(static_cast<dtype>(0.),
59  static_cast<dtype>(1.) - DtypeInfo<dtype>::epsilon());
60  return dist(generator);
61  }
62 
63  //============================================================================
64  // Method Description:
75  template<typename dtype, typename GeneratorType = std::mt19937>
76  NdArray<dtype> rand(GeneratorType& generator, const Shape& inShape)
77  {
78  STATIC_ASSERT_FLOAT(dtype);
79 
80  NdArray<dtype> returnArray(inShape);
81 
82  std::uniform_real_distribution<dtype> dist(static_cast<dtype>(0.),
83  static_cast<dtype>(1.) - DtypeInfo<dtype>::epsilon());
84 
85  std::for_each(returnArray.begin(),
86  returnArray.end(),
87  [&generator, &dist](dtype& value) -> void { value = dist(generator); });
88 
89  return returnArray;
90  }
91  } // namespace detail
92 
93  //============================================================================
94  // Method Description:
102  template<typename dtype>
103  dtype rand()
104  {
105  return detail::rand<dtype>(generator_);
106  }
107 
108  //============================================================================
109  // Method Description:
119  template<typename dtype>
120  NdArray<dtype> rand(const Shape& inShape)
121  {
122  return detail::rand<dtype>(generator_, inShape);
123  }
124 } // namespace nc::random
#define STATIC_ASSERT_FLOAT(dtype)
Definition: StaticAsserts.hpp:50
Holds info about the dtype.
Definition: DtypeInfo.hpp:41
Holds 1D and 2D arrays, the main work horse of the NumCpp library.
Definition: NdArrayCore.hpp:138
iterator end() noexcept
Definition: NdArrayCore.hpp:1576
iterator begin() noexcept
Definition: NdArrayCore.hpp:1268
A Shape Class for NdArrays.
Definition: Core/Shape.hpp:41
dtype rand(GeneratorType &generator)
Definition: rand.hpp:54
Definition: Random/bernoulli.hpp:41
dtype rand()
Definition: rand.hpp:103
static std::mt19937_64 generator_
generator function
Definition: generator.hpp:35
void for_each(InputIt first, InputIt last, UnaryFunction f)
Definition: StlAlgorithms.hpp:225