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std::lognormal_distribution

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C++
 
Numerics библиотеки
 
Псевдослучайных чисел поколения
Двигатели и адаптеры
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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)
Генераторы
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Generators
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random_device(C++11)
Распределения
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Distributions
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Равномерное распределение
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Uniform distributions
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uniform_int_distribution(C++11)
uniform_real_distribution(C++11)
generate_canonical(C++11)
Бернулли распределения
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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)
Распределения Пуассона
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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)
Нормальное распределение
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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)
Выборка распределения
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Sampling distributions
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discrete_distribution(C++11)
piecewise_constant_distribution(C++11)
piecewise_linear_distribution(C++11)
Семенной последовательности
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Seed Sequences
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seed_seq(C++11)
C библиотеки
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C library
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rand
srand
RAND_MAX
 
std::lognormal_distribution
Член функций
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Member functions
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lognormal_distribution::lognormal_distribution
lognormal_distribution::reset
Поколение
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Generation
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lognormal_distribution::operator()
Характеристики
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Characteristics
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lognormal_distribution::param
lognormal_distribution::min
lognormal_distribution::max
Не являющиеся членами функций
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Non-member functions
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operator==
operator!=
operator<<
operator>>
 
Заголовочный файл <random>
template< class RealType = double >
class lognormal_distribution;
 (начиная с C++11)
Lognormal_distribution случайного распределения числа производит случайные числа x > 0 в соответствии с лог-нормального распределения
Original:
The lognormal_distribution random number distribution produces random numbers x > 0 according to a log-normal distribution:
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f(x; m,s) = None
1
sx√2 π
exp⎛
⎜
⎝- None
(ln x - m)2
2s2
⎞
⎟
⎠
Параметр m является средним и параметров s стандартное отклонение.
Original:
The parameter m is the mean and the parameter s the standard deviation.
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Содержание

[править] Член типов

Член типа
Original:
Member type
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 Definition
result_type RealType
param_type
Тип набора параметров, не указано
Original:
the type of the parameter set, unspecified
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[править] Член функций
строит новые распределения
Original:
constructs new distribution
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(public функция-член) [edit]
Восстанавливает внутреннее состояние распределения
Original:
resets the internal state of the distribution
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(public функция-член) [edit]
Поколение
Original:
Generation
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создает следующее случайное число в распределении
Original:
generates the next random number in the distribution
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(public функция-член) [edit]
Характеристики
Original:
Characteristics
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Возвращает среднее (m) распределение параметров
Original:
returns the mean (m) distribution parameter
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(public функция-член) [edit]
возвращает стандартное отклонение (s) распределение параметров
Original:
returns the standard deviation (s) distribution parameter
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(public функция-член) [edit]
получает или задает объект распределения параметра
Original:
gets or sets the distribution parameter object
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(public функция-член) [edit]
возвращает минимальное потенциально сгенерированное значение
Original:
returns the minimum potentially generated value
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(public функция-член) [edit]
возвращает максимальное потенциально сгенерированное значение
Original:
returns the maximum potentially generated value
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(public функция-член) [edit]

[править] Не являющиеся членами функций
сравнивает два объекта распределения
Original:
compares two distribution objects
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(функция) [edit]
осуществляет входной поток и выход на псевдослучайных чисел распределения
Original:
performs stream input and output on pseudo-random number distribution
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(функция) [edit]

[править] Пример

#include <iostream>
#include <iomanip>
#include <string>
#include <map>
#include <random>
#include <cmath>
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
 
    std::lognormal_distribution<> d(1.6, 0.25);
 
    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';
    }
}

Вывод: 

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

[править] Внешние ссылки

Источник — «http://ru.cppreference.com/mwiki/index.php?title=cpp/numeric/random/lognormal_distribution&oldid=28986»