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      std::geometric_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
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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)
      Générateurs
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      Generators
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      random_device (C++11)
      Les distributions
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      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
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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)
      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
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      Member functions
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      geometric_distribution::geometric_distribution
      geometric_distribution::reset
      Génération
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      Generation
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      geometric_distribution::operator()
      Caractéristiques
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      Characteristics
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      geometric_distribution::p
      geometric_distribution::param
      geometric_distribution::min
      geometric_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 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_typeIntType
      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
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      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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      Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/numeric/random/geometric_distribution&oldid=48980 »
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