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std::weibull_distribution

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< cpp‎ | numeric‎ | random

 
 
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
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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
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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::weibull_distribution
Membri funzioni
Original:
Member functions
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weibull_distribution::weibull_distribution
weibull_distribution::reset
Generazione
Original:
Generation
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weibull_distribution::operator()
Caratteristiche
Original:
Characteristics
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weibull_distribution::a
weibull_distribution::b
weibull_distribution::param
weibull_distribution::min
weibull_distribution::max
Non membri funzioni
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Non-member functions
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operator==
operator!=
operator<<
operator>>
 
Defined in header <random>
template< class RealType = double >
class weibull_distribution;
(dal C++11)
Il weibull_distribution soddisfa i requisiti di un RandomNumberDistribution e produce numeri casuali secondo la Distribuzione di Weibull:
Original:
The weibull_distribution meets the requirements of a RandomNumberDistribution and produces random numbers according to the Distribuzione di Weibull:
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f(x;a,b) = None
a
b


None
x
b


a-1
exp

-

None
x
b


a


a is the parametro di forma and b the parametro di scala.

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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(membro pubblico funzione) [edit]
ripristina lo stato interno della distribuzione
Original:
resets the internal state of the distribution
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(membro pubblico funzione) [edit]
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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(membro pubblico funzione) [edit]
Caratteristiche
Original:
Characteristics
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restituisce il parametro di forma (a) parametro di distribuzione
Original:
returns the shape parameter (a) distribution parameter
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(membro pubblico funzione) [edit]
restituisce il parametro della scala di distribuzione (b)
Original:
returns the scale distribution parameter (b)
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(membro pubblico funzione) [edit]
ottiene o imposta l'oggetto parametro di distribuzione
Original:
gets or sets the distribution parameter object
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(membro pubblico funzione) [edit]
restituisce il valore minimo potenzialmente generato
Original:
returns the minimum potentially generated value
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(membro pubblico funzione) [edit]
restituisce il valore massimo potenzialmente generato
Original:
returns the maximum potentially generated value
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(membro pubblico funzione) [edit]

[modifica] Non membri funzioni

confronta due oggetti di distribuzione
Original:
compares two distribution objects
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(funzione) [edit]
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) [edit]

[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::weibull_distribution<> d;
 
    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:

0 *******************
 1 *******************
 2 ******
 3 **
 4 
 5 
 6 
 7 
 8

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