Varianti

    std::negative_binomial_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
    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)
    Generatori
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    Generators
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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
    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)
    Distribuzioni normali
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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)
    Distribuzioni di campionamento
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    Sampling distributions
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    discrete_distribution(C++11)
    piecewise_constant_distribution(C++11)
    piecewise_linear_distribution(C++11)
    Seed Sequenze
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    Seed Sequences
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    seed_seq(C++11)
    Libreria C
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    C library
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    rand
    srand
    RAND_MAX
     
    std::negative_binomial_distribution
    Membri funzioni
    Original:
    Member functions
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    negative_binomial_distribution::negative_binomial_distribution
    negative_binomial_distribution::reset
    Generazione
    Original:
    Generation
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    negative_binomial_distribution::operator()
    Caratteristiche
    Original:
    Characteristics
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    negative_binomial_distribution::p
    negative_binomial_distribution::k
    negative_binomial_distribution::param
    negative_binomial_distribution::min
    negative_binomial_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>
    template< class IntType = int > class negative_binomial_distribution;
    		 (dal C++11)
    Produce casuale non negativo i valori interi, distribuito in base alla funzione di probabilità discrete:
    Original:
    Produces random non-negative integer values i, distributed according to discrete probability function:
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    P(i|k,p) =⎛
    ⎜
    ⎝    k + i − 1
    i    ⎞
    ⎟
    ⎠     · pk
     · (1 − p)i
    Il valore rappresenta il numero di errori in una serie di indipendenti sì / no prove (ognuna riesce con p probabilità), prima di essere esattamente successi k.
    Original:
    The value represents the number of failures in a series of independent yes/no trials (each succeeds with probability p), before exactly k successes occur.
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    Membri tipi

    Membro tipo
    Original:
    Member type
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    		 Definition
    result_type IntType
    param_type
    il tipo di set di parametri, non specificato
    Original:
    the type of the parameter set, unspecified
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    Membri funzioni
    costruisce nuova distribuzione
    Original:
    constructs new distribution
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    (metodo pubblico) [modifica]
    ripristina lo stato interno della distribuzione
    Original:
    resets the internal state of the distribution
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    (metodo pubblico) [modifica]
    Generazione
    Original:
    Generation
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    genera il successivo numero casuale nella distribuzione
    Original:
    generates the next random number in the distribution
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    (metodo pubblico) [modifica]
    Caratteristiche
    Original:
    Characteristics
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    restituisce la k parametro di distribuzione (numero di fallimenti di prova)
    Original:
    returns the k distribution parameter (number of trial failures)
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    (metodo pubblico) [modifica]
    restituisce la distribuzione p parametro (probabilità di un true generatrice di prova)
    Original:
    returns the p distribution parameter (probability of a trial generating true)
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    (metodo pubblico) [modifica]
    ottiene o imposta l'oggetto parametro di distribuzione
    Original:
    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());
    // Pat goes door-to-door selling cookies
    // At each house, there's a 75% chance that she sells one box
    // how many times will she be turned away before selling 5 boxes?
    std::negative_binomial_distribution<> d(5, 0.75);
 
    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';
    }
}

    Output: 

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

    Collegamenti esterni

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