Пространства имён
Варианты
Действия

std::piecewise_constant_distribution

Материал из cppreference.com

This page has been machine-translated from the English version of the wiki using Google Translate.

The translation may contain errors and awkward wording. Hover over text to see the original version. You can help to fix errors and improve the translation. For instructions click here.

Click here for the English version of this page

 
C++
 
Numerics библиотеки
 
Псевдослучайных чисел поколения
Двигатели и адаптеры
Original:
Engines and engine adaptors
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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
Original:
Generators
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
random_device(C++11)
Распределения
Original:
Distributions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Равномерное распределение
Original:
Uniform distributions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
uniform_int_distribution(C++11)
uniform_real_distribution(C++11)
generate_canonical(C++11)
Бернулли распределения
Original:
Bernoulli distributions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
bernoulli_distribution(C++11)
binomial_distribution(C++11)
negative_binomial_distribution(C++11)
geometric_distribution(C++11)
Распределения Пуассона
Original:
Poisson distributions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
poisson_distribution(C++11)
exponential_distribution(C++11)
gamma_distribution(C++11)
weibull_distribution(C++11)
extreme_value_distribution(C++11)
Нормальное распределение
Original:
Normal distributions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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
Original:
Sampling distributions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
discrete_distribution(C++11)
piecewise_constant_distribution(C++11)
piecewise_linear_distribution(C++11)
Семенной последовательности
Original:
Seed Sequences
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
seed_seq(C++11)
C библиотеки
Original:
C library
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
rand
srand
RAND_MAX
 
std::piecewise_constant_distribution
Член функций
Original:
Member functions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
piecewise_constant_distribution::piecewise_constant_distribution
piecewise_constant_distribution::reset
Поколение
Original:
Generation
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
piecewise_constant_distribution::operator()
Характеристики
Original:
Characteristics
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
piecewise_constant_distribution::intervals
piecewise_constant_distribution::densities
piecewise_constant_distribution::param
piecewise_constant_distribution::min
piecewise_constant_distribution::max
Не являющиеся членами функций
Original:
Non-member functions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
operator==
operator!=
operator<<
operator>>
 
Заголовочный файл <random>
template< class RealType = double >
class piecewise_constant_distribution;
 (начиная с C++11)
std::piecewise_constant_distribution производит случайные числа с плавающей точкой, которые равномерно распределены внутри каждого из нескольких [b
i, b
i+1) отрезков, каждый со своим собственным w
i веса. Множество границ интервала и набора веса являются параметрами этого распределения.
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.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Плотность вероятности для любого b
i≤x<b
i+1 является None
w
k
S (b
i+1 - b
i)
. где S это сумма всех весов.
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.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Содержание

[править] Член типов

Член типа
Original:
Member type
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
 Definition
result_type RealType
param_type
Тип набора параметров, не указано
Original:
the type of the parameter set, unspecified
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[править] Член функций
строит новые распределения
Original:
constructs new distribution
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(public функция-член) [edit]
Восстанавливает внутреннее состояние распределения
Original:
resets the internal state of the distribution
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(public функция-член) [edit]
Поколение
Original:
Generation
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
создает следующее случайное число в распределении
Original:
generates the next random number in the distribution
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(public функция-член) [edit]
Характеристики
Original:
Characteristics
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
получает список границ интервала
Original:
obtains the list of interval boundaries
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(public функция-член) [edit]
получает список плотности вероятности
Original:
obtains the list of probability densities
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(public функция-член) [edit]
получает или задает объект распределения параметра
Original:
gets or sets the distribution parameter object
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(public функция-член) [edit]
возвращает минимальное потенциально сгенерированное значение
Original:
returns the minimum potentially generated value
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(public функция-член) [edit]
возвращает максимальное потенциально сгенерированное значение
Original:
returns the maximum potentially generated value
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(public функция-член) [edit]

[править] Не являющиеся членами функций
сравнивает два объекта распределения
Original:
compares two distribution objects
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(функция) [edit]
осуществляет входной поток и выход на псевдослучайных чисел распределения
Original:
performs stream input and output on pseudo-random number distribution
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(функция) [edit]

[править] Пример

#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';
    }
}

Вывод: 

0 **************************************************
10 **********
11 *********
12 *********
13 **********
14 *********
Источник — «http://ru.cppreference.com/mwiki/index.php?title=cpp/numeric/random/piecewise_constant_distribution&oldid=28692»