Varianti

    std::bernoulli_distribution

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    <metanoindex/>

     
    C++
     
    Numeri libreria
    Comuni funzioni matematiche
    Virgola mobile ambiente
    I numeri complessi
    Array numerici
    Pseudo-casuale generazione
    In fase di compilazione aritmetica razionale (C++11)
    Generici operazioni numeriche
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    Generic numeric operations
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    iota(C++11)
    accumulate
    inner_product
    adjacent_difference
    partial_sum
     
    Pseudo-casuale generazione
    Motori e adattatori del motore
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    Engines and engine adaptors
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    linear_congruential_engine(C++11)
    mersenne_twister_engine(C++11)
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    Generatori
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    random_device(C++11)
    Distribuzioni
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    Distributions
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    Distribuzioni uniformi
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    Uniform distributions
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    uniform_int_distribution(C++11)
    uniform_real_distribution(C++11)
    generate_canonical(C++11)
    Bernoulli distribuzioni
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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)
    Poisson distribuzioni
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    Poisson distributions
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    poisson_distribution(C++11)
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    Distribuzioni normali
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    Normal distributions
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    C library
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    rand
    srand
    RAND_MAX
     
    std::bernoulli_distribution
    Membri funzioni
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    Member functions
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    bernoulli_distribution::bernoulli_distribution
    bernoulli_distribution::reset
    Generazione
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    Generation
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    bernoulli_distribution::operator()
    Caratteristiche
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    Characteristics
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    bernoulli_distribution::param
    bernoulli_distribution::min
    bernoulli_distribution::max
    Non membri funzioni
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    Non-member functions
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    operator==
    operator!=
    operator<<
    operator>>
     
    <tbody> </tbody>
    Elemento definito nell'header <random>
    class bernoulli_distribution;
    		 (dal C++11)
    Produce casuali valori booleani, in base alla funzione di probabilità discreta. La probabilità di true è
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    Produces random boolean values, according to the discrete probability function. The probability of true is
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    P(b|p) =⎧
    ⎨
    ⎩    p if b == true 
    1 − p if b == false

    Membri tipi

    Membro tipo
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    Member type
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    		 Definition
    result_type bool
    param_type
    il tipo di set di parametri, non specificato
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    the type of the parameter set, unspecified
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    Membri funzioni
    costruisce nuova distribuzione
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    constructs new distribution
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    (metodo pubblico) [modifica]
    ripristina lo stato interno della distribuzione
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    resets the internal state of the distribution
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    (metodo pubblico) [modifica]
    Generazione
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    Generation
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    genera il successivo numero casuale nella distribuzione
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    generates the next random number in the distribution
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    (metodo pubblico) [modifica]
    Caratteristiche
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    Characteristics
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    restituisce la distribuzione p parametro (probabilità di generare true)
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    returns the p distribution parameter (probability of generating true)
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    (metodo pubblico) [modifica]
    ottiene o imposta l'oggetto parametro di distribuzione
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    gets or sets the distribution parameter object
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    (metodo pubblico) [modifica]
    restituisce il valore minimo potenzialmente generato
    Original:
    returns the minimum potentially generated value
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    (metodo pubblico) [modifica]
    restituisce il valore massimo potenzialmente generato
    Original:
    returns the maximum potentially generated value
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    (metodo pubblico) [modifica]

    Non membri funzioni
    confronta due oggetti di distribuzione
    Original:
    compares two distribution objects
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    (funzione) [modifica]
    esegue flusso di ingresso e di uscita sul pseudo-casuale distribuzione numerica
    Original:
    performs stream input and output on pseudo-random number distribution
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    (funzione) [modifica]

    Esempio

    #include <iostream>
#include <iomanip>
#include <string>
#include <map>
#include <random>

int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
    // give "true" 1/4 of the time
    // give "false" 3/4 of the time
    std::bernoulli_distribution d(0.25);
 
    std::map<bool, int> hist;
    for(int n=0; n<10000; ++n) {
        ++hist[d(gen)];
    }
    for(auto p : hist) {
        std::cout << std::boolalpha << std::setw(5) << p.first
                  << ' ' << std::string(p.second/500, '*') << '\n';
    }
}

    Output: 

    false ***************
 true ****

    Collegamenti esterni

    Weisstein, Eric W. "Bernoulli Distribution." Da MathWorld - Una risorsa Web Wolfram.
    Original:
    Weisstein, Eric W. "Bernoulli Distribution." From MathWorld--A Wolfram Web Resource.
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