Varianti

    std::lognormal_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)
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    Generatori
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    random_device(C++11)
    Distribuzioni
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    Distribuzioni uniformi
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    Uniform distributions
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    uniform_int_distribution(C++11)
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    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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    normal_distribution(C++11)
    lognormal_distribution(C++11)
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    Seed Sequences
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    Libreria C
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    C library
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    rand
    srand
    RAND_MAX
     
    std::lognormal_distribution
    Membri funzioni
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    Member functions
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    lognormal_distribution::lognormal_distribution
    lognormal_distribution::reset
    Generazione
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    Generation
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    lognormal_distribution::operator()
    Caratteristiche
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    Characteristics
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    lognormal_distribution::param
    lognormal_distribution::min
    lognormal_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 RealType = double > class lognormal_distribution;
    		 (dal C++11)
    Il numero casuale distribuzione lognormal_distribution produce numeri casuali x > 0 secondo una distribuzione log-normale:
    Original:
    The lognormal_distribution random number distribution produces random numbers x > 0 according to a log-normal distribution:
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    f(x; m,s) = None
    1
    sx√2 π
    exp⎛
    ⎜
    ⎝    - None
    (ln x - m)2
    2s2
    ⎞
    ⎟
    ⎠
    Il m parametro è la media e il parametro s la deviazione standard.
    Original:
    The parameter m is the mean and the parameter s the standard deviation.
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    Membri tipi

    Membro tipo
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    Member type
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    		 Definition
    result_type RealType
    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
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    Characteristics
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    restituisce l'(m) parametro di distribuzione media
    Original:
    returns the mean (m) distribution parameter
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    (metodo pubblico) [modifica]
    restituisce la deviazione standard (s) parametro di distribuzione
    Original:
    returns the standard deviation (s) distribution parameter
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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>
#include <cmath>
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());

    std::lognormal_distribution<> d(1.6, 0.25);
 
    std::map<int, int> hist;
    for(int n=0; n<10000; ++n) {
        ++hist[std::round(d(gen))];
    }
    for(auto p : hist) {
        std::cout << std::fixed << std::setprecision(1) << std::setw(2)
                  << p.first << ' ' << std::string(p.second/200, '*') << '\n';
    }
}

    Output: 

    2 
 3 ***
 4 *************
 5 ***************
 6 *********
 7 ****
 8 *
 9 
10 
11 
12

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