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std::normal_distribution

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< cpp‎ | numeric‎ | random

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C++
 
Bibliothèque Numerics
Fonctions mathématiques courantes
Virgule flottante environnement
Nombres complexes
Tableaux numériques
La génération de nombres pseudo-aléatoires
Moment de la compilation arithmétique rationnelle (C++11)
Génériques des opérations numériques
Original:
Generic numeric operations
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iota (C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
La génération de nombres pseudo-aléatoires
Les moteurs et les adaptateurs de moteur
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)
Générateurs
Original:
Generators
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random_device (C++11)
Les distributions
Original:
Distributions
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Distributions uniformes
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Uniform distributions
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uniform_int_distribution (C++11)
uniform_real_distribution (C++11)
generate_canonical (C++11)
Distributions de Bernoulli
Original:
Bernoulli distributions
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bernoulli_distribution (C++11)
binomial_distribution (C++11)
negative_binomial_distribution (C++11)
geometric_distribution (C++11)
Distributions de Poisson
Original:
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)
Les distributions normales
Original:
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)
Distributions d'échantillonnage
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Sampling distributions
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discrete_distribution (C++11)
piecewise_constant_distribution (C++11)
piecewise_linear_distribution (C++11)
Séquences de semences
Original:
Seed Sequences
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seed_seq (C++11)
Bibliothèque C
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C library
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rand
srand
RAND_MAX
 
std::normal_distribution
Les fonctions membres
Original:
Member functions
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normal_distribution::normal_distribution
normal_distribution::reset
Génération
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Generation
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normal_distribution::operator()
Caractéristiques
Original:
Characteristics
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normal_distribution::mean
normal_distribution::stddev
normal_distribution::param
normal_distribution::min
normal_distribution::max
Tiers fonctions
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Non-member functions
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operator==
operator!=
operator<<
operator>>
 
Déclaré dans l'en-tête <random>
template< class RealType = double >
class normal_distribution;
 (depuis C++11)

Normal (ou gaussien) de distribution de nombres aléatoires:

f(x; μ,σ) = None
1
σ√2π
 exp⎛
⎜
⎝-
1
2
 ⎛
⎜
⎝
x-μ
σ
⎞
⎟
⎠2
⎞
⎟
⎠
Avec la moyenne μ et l'écart-type (' stddev) σ .
Original:
With the veux dire μ and the écart-type (stddev) σ.
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Sommaire

[modifier] Types de membres

Type du membre Définition
result_type RealType
param_type
le type du jeu de paramètres, sans précision
Original:
the type of the parameter set, unspecified
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[modifier] Fonctions membres
construit distribution
Original:
constructs new distribution
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(fonction membre publique) [edit]
réinitialise l'état interne de la distribution
Original:
resets the internal state of the distribution
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(fonction membre publique) [edit]
Génération
Original:
Generation
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génère le nombre aléatoire suivant dans la distribution
Original:
generates the next random number in the distribution
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(fonction membre publique) [edit]
Caractéristiques
Original:
Characteristics
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retourne le paramètre de distribution de moyenne (μ)
Original:
returns the mean (μ) distribution parameter
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(fonction membre publique) [edit]
renvoie le paramètre de l'écart-type de distribution (σ)
Original:
returns the standard deviation (σ) distribution parameter
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(fonction membre publique) [edit]
obtient ou définit l'objet de paramètre de distribution
Original:
gets or sets the distribution parameter object
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(fonction membre publique) [edit]
renvoie la valeur minimale potentiellement générées
Original:
returns the minimum potentially generated value
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(fonction membre publique) [edit]
renvoie la valeur maximale potentiellement générées
Original:
returns the maximum potentially generated value
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(fonction membre publique) [edit]

[modifier] Fonctions annexes
compare deux objets de distribution
Original:
compares two distribution objects
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(fonction) [edit]
effectue flux d'entrée et de sortie sur la distribution de nombre pseudo-aléatoire
Original:
performs stream input and output on pseudo-random number distribution
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(fonction) [edit]

[modifier] Exemple

#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';
    }
}

Résultat : 

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

[modifier] Liens externes

Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/numeric/random/normal_distribution&oldid=49973 »