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std::geometric_distribution

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< cpp‎ | numeric‎ | random

 
 
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
Original:
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
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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)
Les distributions normales
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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)
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
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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::geometric_distribution
Les fonctions membres
Original:
Member functions
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geometric_distribution::geometric_distribution
geometric_distribution::reset
Génération
Original:
Generation
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geometric_distribution::operator()
Caractéristiques
Original:
Characteristics
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geometric_distribution::p
geometric_distribution::param
geometric_distribution::min
geometric_distribution::max
Tiers fonctions
Original:
Non-member functions
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operator==
operator!=
operator<<
operator>>
 
Defined in header <random>
template< class IntType = int >
class geometric_distribution;
(depuis C++11)
Produit aléatoire non négative i valeurs entières, réparties selon la fonction de probabilité discrète:
Original:
Produces random non-negative integer values i, distributed according to discrete probability function:
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P(i|p) = p · (1 − p)i
La valeur représente le nombre de oui / non essais (chaque réussite avec p probabilité) qui sont nécessaires pour obtenir un seul succès .
Original:
The value represents the number of yes/no trials (each succeeding with probability p) which are necessary to obtain a single success.
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std::geometric_distribution<>(p) est exactement équivalente à std::negative_binomial_distribution<>(1, p). Il est également l'équivalent discret de std::exponential_distribution .
Original:
std::geometric_distribution<>(p) is exactly equivalent to std::negative_binomial_distribution<>(1, p). It is also the discrete counterpart of std::exponential_distribution.
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Sommaire

[modifier] Types de membres

Type du membre Définition
result_type IntType
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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renvoie le paramètre p de distribution (probabilité de true génératrice d'essai)
Original:
returns the p distribution parameter (probability of a trial generating true)
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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

geometric_distribution <> (0,5) est la valeur par défaut et représente le nombre de lancers de pièces qui sont nécessaires pour obtenir des têtes
Original:
geometric_distribution<>(0.5) is the default and represents the number of coin tosses that are required to get heads
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#include <iostream>
#include <iomanip>
#include <string>
#include <map>
#include <random>
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
 
    std::geometric_distribution<> d; // same as std::negative_binomial_distribution<> d(1, 0.5);
 
    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';
    }
}

Résultat :

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

[modifier] Liens externes

Weisstein, Eric W. "Geometric Distribution." De MathWorld - Une ressource Web Wolfram .
Original:
Weisstein, Eric W. "Geometric Distribution." From MathWorld--A Wolfram Web Resource.
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