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std::normal_distribution

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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
Original:
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)
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
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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)
Distribuzioni normali
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)
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::normal_distribution
Membri funzioni
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Member functions
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normal_distribution::normal_distribution
normal_distribution::reset
Generazione
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Generation
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normal_distribution::operator()
Caratteristiche
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Characteristics
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normal_distribution::mean
normal_distribution::stddev
normal_distribution::param
normal_distribution::min
normal_distribution::max
Non membri funzioni
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Non-member functions
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operator==
operator!=
operator<<
operator>>
 
Elemento definito nell'header <random>
template< class RealType = double >
class normal_distribution;
 (dal C++11)

Normale (o Guassian) la distribuzione di numeri casuali:

f(x; μ,σ) = None
1
σ√2π
 exp⎛
⎜
⎝-
1
2
 ⎛
⎜
⎝
x-μ
σ
⎞
⎟
⎠2
⎞
⎟
⎠
Con la dire μ e il deviazione standard (stddev') σ.
Original:
With the dire μ and the deviazione standard (stddev) σ.
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Indice

[modifica] Membri tipi

Membro tipo
Original:
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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[modifica] 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 l'(μ) parametro di distribuzione media
Original:
returns the mean (μ) distribution parameter
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(metodo pubblico) [modifica]
restituisce la deviazione standard (σ) parametro di distribuzione
Original:
returns the standard deviation (σ) 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]

[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]

[modifica] Esempio

#include <iostream>
#include <iomanip>
#include <string>
#include <map>
#include <random>
#include <cmath>
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
 
    // values near the mean are the most likely
    // standard deviation affects the dispersion of generated values from the mean
    std::normal_distribution<> d(5,2);
 
    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 
-1 
 0 
 1 *
 2 ***
 3 ******
 4 ********
 5 **********
 6 ********
 7 *****
 8 ***
 9 *
10 
11 
12

[modifica] Collegamenti esterni

Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/numeric/random/normal_distribution&oldid=26469"