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std::piecewise_linear_distribution

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C++
 
ニューメリックスライブラリ
一般的な数学関数
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複素数
数値配列
擬似乱数生成
コンパイル時有理数演算 (C++11)
汎用の数値演算
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accumulate
inner_product
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partial_sum
 
擬似乱数生成
エンジンとエンジンアダプタ
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一様分布
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uniform_int_distribution(C++11)
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Bernoulli distributions
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bernoulli_distribution(C++11)
binomial_distribution(C++11)
negative_binomial_distribution(C++11)
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poisson_distribution(C++11)
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piecewise_linear_distribution(C++11)
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std::piecewise_linear_distribution
メンバ関数
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Member functions
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piecewise_linear_distribution::piecewise_linear_distribution
piecewise_linear_distribution::reset
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piecewise_linear_distribution::operator()
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Characteristics
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piecewise_linear_distribution::param
piecewise_linear_distribution::min
piecewise_linear_distribution::max
非メンバ関数
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Non-member functions
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operator==
operator!=
operator<<
operator>>
 
Defined in header <random>
template< class RealType = double >
class piecewise_linear_distribution;
 (C + + 11以来)

std::piecewise_linear_distribution produces random floating-point numbers, which are distributed according to a linear probability density function within each of the several subintervals [b
i, b
i+1). The distribution is such that the probability density at each interval boundary is exactly the predefined value p
i.

The probability density for any b
i≤x<b
i+1 is p
i
b
i+1-x
b
i+1-b
i
+ p
i+1
x-b
i
b
i+1-b
i
, where probability densities at interval boundaries p
k are calculated as w
k/S where S is the sum of all None
1
2
(w
k+w
k+1)(b
k+1−b
k).

The set of interval boundaries b
i and the set of weights at boundaries w
i are the parameters of this distribution.

目次

[編集] メンバータイプ

メンバー·タイプ
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Member type
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 Definition
result_type RealType
param_type
不特定のパラメータセットのタイプ
Original:
the type of the parameter set, unspecified
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[編集] メンバ関数
新しいディストリビューションを構築します
Original:
constructs new distribution
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(パブリックメンバ関数) [edit]
リセットさ分布の内部状態
Original:
resets the internal state of the distribution
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(パブリックメンバ関数) [edit]
世代
Original:
Generation
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ディストリビューションの次の乱数を生成します
Original:
generates the next random number in the distribution
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(パブリックメンバ関数) [edit]
特性
Original:
Characteristics
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区間の境界のリストを取得します
Original:
obtains the list of interval boundaries
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(パブリックメンバ関数) [edit]
区間の境界での確率密度のリストを取得します
Original:
obtains the list of probability densities at interval boundaries
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(パブリックメンバ関数) [edit]
分布パラメータオブジェクトを取得または設定します
Original:
gets or sets the distribution parameter object
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(パブリックメンバ関数) [edit]
最小潜在的に生成された値を返します
Original:
returns the minimum potentially generated value
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(パブリックメンバ関数) [edit]
最大潜在的に生成された値を返します
Original:
returns the maximum potentially generated value
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(パブリックメンバ関数) [edit]

[編集] 非メンバ関数
2つのディストリビューションオブジェクトを比較します
Original:
compares two distribution objects
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(機能) [edit]
擬似乱数分布にストリーム入出力を行います
Original:
performs stream input and output on pseudo-random number distribution
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(機能) [edit]

[編集] 例

#include <iostream>
#include <iomanip>
#include <string>
#include <map>
#include <random>
 
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
    // increase the probability from 0 to 5
    // remain flat from 5 to 10
    // decrease from 10 to 15 at the same rate
    std::vector<double> i{0, 5, 10, 15};
    std::vector<double> w{0, 1,   1, 0};
    std::piecewise_linear_distribution<> d(i.begin(), i.end(), w.begin());
 
    std::map<int, int> hist;
    for(int n=0; n<10000; ++n) {
        ++hist[d(gen)];
    }
    for(auto p : hist) {
        std::cout << std::setw(2) << p.first << ' ' << std::string(p.second/100,
    }
}

Output: 

0 *
 1 ***
 2 ****
 3 ******
 4 *********
 5 *********
 6 *********
 7 **********
 8 *********
 9 **********
10 *********
11 *******
12 ****
13 ***
14 *
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