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std::piecewise_constant_distribution

提供: cppreference.com
< cpp‎ | numeric‎ | random

 
 
ニューメリックスライブラリ
一般的な数学関数
浮動小数点環境
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
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
擬似乱数生成
エンジンとエンジンアダプタ
Original:
Engines and engine adaptors
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linear_congruential_engine(C++11)
mersenne_twister_engine(C++11)
subtract_with_carry_engine(C++11)
discard_block_engine(C++11)
independent_bits_engine(C++11)
shuffle_order_engine(C++11)
ジェネレータ
Original:
Generators
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random_device(C++11)
ディストリビューション
Original:
Distributions
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一様分布
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Uniform distributions
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uniform_int_distribution(C++11)
uniform_real_distribution(C++11)
generate_canonical(C++11)
ベルヌーイ分布
Original:
Bernoulli distributions
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bernoulli_distribution(C++11)
binomial_distribution(C++11)
negative_binomial_distribution(C++11)
geometric_distribution(C++11)
ポアソン分布
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Poisson distributions
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poisson_distribution(C++11)
exponential_distribution(C++11)
gamma_distribution(C++11)
weibull_distribution(C++11)
extreme_value_distribution(C++11)
正規分布
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Normal distributions
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normal_distribution(C++11)
lognormal_distribution(C++11)
chi_squared_distribution(C++11)
cauchy_distribution(C++11)
fisher_f_distribution(C++11)
student_t_distribution(C++11)
サンプリング分布
Original:
Sampling distributions
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discrete_distribution(C++11)
piecewise_constant_distribution(C++11)
piecewise_linear_distribution(C++11)
シードシーケンス
Original:
Seed Sequences
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seed_seq(C++11)
Cライブラリ
Original:
C library
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rand
srand
RAND_MAX
 
std::piecewise_constant_distribution
メンバ関数
Original:
Member functions
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piecewise_constant_distribution::piecewise_constant_distribution
piecewise_constant_distribution::reset
世代
Original:
Generation
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piecewise_constant_distribution::operator()
特性
Original:
Characteristics
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piecewise_constant_distribution::intervals
piecewise_constant_distribution::densities
piecewise_constant_distribution::param
piecewise_constant_distribution::min
piecewise_constant_distribution::max
非メンバ関数
Original:
Non-member functions
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operator==
operator!=
operator<<
operator>>
 
Defined in header <random>
template< class RealType = double >
class piecewise_constant_distribution;
(C++11およびそれ以降)
std::piecewise_constant_distribution均一にいくつかの部分区間の[b
i
, b
i+1
)
のそれぞれの中に分布しているランダムな浮動小数点数、自重のw
i
でそれぞれを生成します。区間の境界のセットと重みのセットは、この分布のパラメータです.
Original:
std::piecewise_constant_distribution produces random floating-point numbers, which are uniformly distributed within each of the several subintervals [b
i
, b
i+1
)
, each with its own weight w
i
. The set of interval boundaries and the set of weights are the parameters of this distribution.
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任意b
i
≤x<b
i+1
の確率密度はNone
w
k
S (b
i+1
- b
i
)
です。どこSは、すべての重みの合計です.
Original:
The probability density for any b
i
≤x<b
i+1
is None
w
k
S (b
i+1
- b
i
)
. where S is the sum of all weights.
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目次

[編集] メンバータイプ

メンバー·タイプ
Original:
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]
確率密度関数のリストを取得します
Original:
obtains the list of probability densities
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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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(関数) [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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(関数) [edit]

[編集]

#include <iostream>
#include <string>
#include <map>
#include <random>
 
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
    // 50% of the time, generate a random number between 0 and 1
    // 50% of the time, generate a random number between 10 and 15
    std::vector<double> i{0,  1, 10, 15};
    std::vector<double> w{  1,  0,  1};
    std::piecewise_constant_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 << p.first << ' ' << std::string(p.second/100, '*') << '\n';
    }
}

Output:

0 **************************************************
10 **********
11 *********
12 *********
13 **********
14 *********