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std::piecewise_linear_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
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Generic numeric operations
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iota(C++11)
accumulate
inner_product
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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)
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extreme_value_distribution(C++11)
Distribuzioni normali
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Normal distributions
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normal_distribution(C++11)
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Distribuzioni di campionamento
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discrete_distribution(C++11)
piecewise_constant_distribution(C++11)
piecewise_linear_distribution(C++11)
Seed Sequenze
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Libreria C
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RAND_MAX
 
std::piecewise_linear_distribution
Membri funzioni
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Member functions
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piecewise_linear_distribution::piecewise_linear_distribution
piecewise_linear_distribution::reset
Generazione
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Generation
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piecewise_linear_distribution::operator()
Caratteristiche
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Characteristics
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piecewise_linear_distribution::param
piecewise_linear_distribution::min
piecewise_linear_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 piecewise_linear_distribution;
 (dal C++11)

std::piecewise_linear_distribution produces random floating-point numbers, which are distributed according to a linear probability density function within each of the several subintervals [b
i, b
i+1). The distribution is such that the probability density at each interval boundary is exactly the predefined value p
i.

The probability density for any b
i≤x<b
i+1 is p
i
b
i+1-x
b
i+1-b
i
+ p
i+1
x-b
i
b
i+1-b
i
, where probability densities at interval boundaries p
k are calculated as w
k/S where S is the sum of all None
1
2
(w
k+w
k+1)(b
k+1−b
k).

The set of interval boundaries b
i and the set of weights at boundaries w
i are the parameters of this distribution.

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 ai confini intervallo
Original:
obtains the list of probability densities at interval boundaries
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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>
 
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
    // increase the probability from 0 to 5
    // remain flat from 5 to 10
    // decrease from 10 to 15 at the same rate
    std::vector<double> i{0, 5, 10, 15};
    std::vector<double> w{0, 1,   1, 0};
    std::piecewise_linear_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 << std::setw(2) << p.first << ' ' << std::string(p.second/100,
    }
}

Output: 

0 *
 1 ***
 2 ****
 3 ******
 4 *********
 5 *********
 6 *********
 7 **********
 8 *********
 9 **********
10 *********
11 *******
12 ****
13 ***
14 *
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/numeric/random/piecewise_linear_distribution&oldid=26486"