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std::piecewise_constant_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
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
Original:
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
Original:
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
Original:
Non-member functions
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operator==
operator!=
operator<<
operator>>
 
Defined in header <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_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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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 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';
    }
}

Résultat :

0 **************************************************
10 **********
11 *********
12 *********
13 **********
14 *********