NumCpp  2.10.1
A Templatized Header Only C++ Implementation of the Python NumPy Library
exponential.hpp
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1 #pragma once
29 
30 #include <algorithm>
31 #include <random>
32 
34 #include "NumCpp/Core/Shape.hpp"
35 #include "NumCpp/NdArray.hpp"
37 
38 namespace nc::random
39 {
40  namespace detail
41  {
42  //============================================================================
43  // Method Description:
53  template<typename dtype, typename GeneratorType = std::mt19937>
54  dtype exponential(GeneratorType& generator, dtype inScaleValue = 1)
55  {
57 
58  std::exponential_distribution<dtype> dist(inScaleValue);
59  return dist(generator);
60  }
61 
62  //============================================================================
63  // Method Description:
75  template<typename dtype, typename GeneratorType = std::mt19937>
76  NdArray<dtype> exponential(GeneratorType& generator, const Shape& inShape, dtype inScaleValue = 1)
77  {
79 
80  NdArray<dtype> returnArray(inShape);
81 
82  std::exponential_distribution<dtype> dist(inScaleValue);
83 
84  std::for_each(returnArray.begin(),
85  returnArray.end(),
86  [&generator, &dist](dtype& value) -> void { value = dist(generator); });
87 
88  return returnArray;
89  }
90  } // namespace detail
91 
92  //============================================================================
93  // Method Description:
102  template<typename dtype>
103  dtype exponential(dtype inScaleValue = 1)
104  {
105  return detail::exponential(generator_, inScaleValue);
106  }
107 
108  //============================================================================
109  // Method Description:
120  template<typename dtype>
121  NdArray<dtype> exponential(const Shape& inShape, dtype inScaleValue = 1)
122  {
123  return detail::exponential(generator_, inShape, inScaleValue);
124  }
125 } // namespace nc::random
#define STATIC_ASSERT_ARITHMETIC(dtype)
Definition: StaticAsserts.hpp:39
Holds 1D and 2D arrays, the main work horse of the NumCpp library.
Definition: NdArrayCore.hpp:138
iterator end() noexcept
Definition: NdArrayCore.hpp:1566
iterator begin() noexcept
Definition: NdArrayCore.hpp:1258
A Shape Class for NdArrays.
Definition: Core/Shape.hpp:41
dtype exponential(GeneratorType &generator, dtype inScaleValue=1)
Definition: exponential.hpp:54
Definition: Random/bernoulli.hpp:41
dtype exponential(dtype inScaleValue=1)
Definition: exponential.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