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std::piecewise_constant_distribution

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< cpp‎ | numeric‎ | random

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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
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
Original:
Generators
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random_device(C++11)
Distribuzioni
Original:
Distributions
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Distribuzioni uniformi
Original:
Uniform distributions
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uniform_int_distribution(C++11)
uniform_real_distribution(C++11)
generate_canonical(C++11)
Bernoulli distribuzioni
Original:
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
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
Original:
Sampling distributions
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discrete_distribution(C++11)
piecewise_constant_distribution(C++11)
piecewise_linear_distribution(C++11)
Seed Sequenze
Original:
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::piecewise_constant_distribution
Membri funzioni
Original:
Member functions
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piecewise_constant_distribution::piecewise_constant_distribution
piecewise_constant_distribution::reset
Generazione
Original:
Generation
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piecewise_constant_distribution::operator()
Caratteristiche
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
Non membri funzioni
Original:
Non-member functions
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operator==
operator!=
operator<<
operator>>
 
Elemento definito nell'header <random>
template< class RealType = double >
class piecewise_constant_distribution;
 (dal C++11)
std::piecewise_constant_distribution produce casuali numeri a virgola mobile, che sono distribuiti in modo uniforme all'interno di ciascuna delle [b
i, b
i+1) diversi sottointervalli, ciascuno con la propria w
i peso. L'insieme dei confini intervallo e l'insieme di pesi sono i parametri di questa distribuzione.
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 densità di probabilità per ogni b
i≤x<b
i+1 è None
w
k
S (b
i+1 - b
i)
. dove S è la somma di tutti i pesi.
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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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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ottiene l'elenco dei confini intervallo
Original:
obtains the list of interval boundaries
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(metodo pubblico) [modifica]
ottiene l'elenco delle densità di probabilità
Original:
obtains the list of probability densities
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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 <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';
    }
}

Output: 

0 **************************************************
10 **********
11 *********
12 *********
13 **********
14 *********
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/numeric/random/piecewise_constant_distribution&oldid=26479"