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std::normal_distribution

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< cpp‎ | numeric‎ | random

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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
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
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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
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Generators
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random_device(C++11)
ディストリビューション
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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
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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
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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
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Seed Sequences
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seed_seq(C++11)
Cライブラリ
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C library
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rand
srand
RAND_MAX
 
std::normal_distribution
メンバ関数
Original:
Member functions
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normal_distribution::normal_distribution
normal_distribution::reset
世代
Original:
Generation
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normal_distribution::operator()
特性
Original:
Characteristics
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normal_distribution::mean
normal_distribution::stddev
normal_distribution::param
normal_distribution::min
normal_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 normal_distribution;
 (C++11およびそれ以降)

ノーマル（またはガウス）乱数分布:

f(x; μ,σ) = None
1
σ√2π
 exp⎛
⎜
⎝-
1
2
 ⎛
⎜
⎝
x-μ
σ
⎞
⎟
⎠2
⎞
⎟
⎠
とを意味しますμと標準偏差（ STDDEV）σ.
Original:
With the を意味します μ and the 標準偏差 (stddev) σ.
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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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平均（μ）分布パラメータを返します
Original:
returns the mean (μ) distribution parameter
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(パブリックメンバ関数) [edit]
標準偏差（σ）分布パラメータを返します
Original:
returns the standard deviation (σ) distribution parameter
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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] 例

このコードを実行します
#include <iostream>
#include <iomanip>
#include <string>
#include <map>
#include <random>
#include <cmath>
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
 
    // values near the mean are the most likely
    // standard deviation affects the dispersion of generated values from the mean
    std::normal_distribution<> d(5,2);
 
    std::map<int, int> hist;
    for(int n=0; n<10000; ++n) {
        ++hist[std::round(d(gen))];
    }
    for(auto p : hist) {
        std::cout << std::fixed << std::setprecision(1) << std::setw(2)
                  << p.first << ' ' << std::string(p.second/200, '*') << '\n';
    }
}

出力: 

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

[編集] 外部リンク

「http://ja.cppreference.com/mwiki/index.php?title=cpp/numeric/random/normal_distribution&oldid=27653」から取得