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      std::piecewise_constant_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
      Original:
      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::piecewise_constant_distribution
      Les fonctions membres
      Original:
      Member functions
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      piecewise_constant_distribution::piecewise_constant_distribution
      piecewise_constant_distribution::reset
      Génération
      Original:
      Generation
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      piecewise_constant_distribution::operator()
      Caractéristiques
      Original:
      Characteristics
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      piecewise_constant_distribution::intervals
      piecewise_constant_distribution::densities
      piecewise_constant_distribution::param
      piecewise_constant_distribution::min
      piecewise_constant_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 piecewise_constant_distribution;
      		 (depuis C++11)
      std::piecewise_constant_distribution produit aléatoires nombres à virgule flottante, qui sont uniformément réparties à l'intérieur de chacun des sous-intervalles [b
      i      , b
      i+1      )       plusieurs, chacun avec son propre poids w
      i      . L'ensemble de limites d'intervalles et l'ensemble des coefficients de pondération sont les paramètres de cette distribution .
      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.
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      La densité de probabilité pour tout b
      i      ≤x<b
      i+1       est None
      w
      k
      S (b
      i+1       - b
      i      )
      . où S est la somme de tous les poids .
      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.
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      Sommaire

      [modifier]Types de membres

      Type du membre Définition
      result_typeRealType
      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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      obtient la liste des limites d'intervalles
      Original:
      obtains the list of interval boundaries
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      (fonction membre publique)[edit]
      obtient la liste des densités de probabilité
      Original:
      obtains the list of probability densities
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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 <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 15std::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';}}

      Résultat : 

      0 ************************************************** 10 ********** 11 ********* 12 ********* 13 ********** 14 *********
      Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/numeric/random/piecewise_constant_distribution&oldid=49044 »
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