Espaços nominais
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std::geometric_distribution

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< cpp‎ | numeric‎ | random

 
 
Biblioteca numéricos
Funções matemáticas comuns
De ponto flutuante ambiente
Números complexos
Matrizes numéricas
Pseudo-aleatório de geração de números
Tempo de compilação aritmética racional (C++11)
Genéricos operações numéricas
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Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
Pseudo-aleatório de geração de números
Motores e adaptadores de motor
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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)
Geradores
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Generators
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random_device(C++11)
Distribuições
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Distributions
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Distribuições uniformes
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Uniform distributions
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uniform_int_distribution(C++11)
uniform_real_distribution(C++11)
generate_canonical(C++11)
Distribuições de Bernoulli
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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)
Distribuições de Poisson
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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)
Distribuições normais
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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)
Distribuições de amostragem
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Sampling distributions
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discrete_distribution(C++11)
piecewise_constant_distribution(C++11)
piecewise_linear_distribution(C++11)
Seqüências de sementes
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Seed Sequences
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seed_seq(C++11)
C biblioteca
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C library
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rand
srand
RAND_MAX
 
std::geometric_distribution
Funções de membro
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Member functions
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geometric_distribution::geometric_distribution
geometric_distribution::reset
Geração
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Generation
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geometric_distribution::operator()
Características
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Characteristics
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geometric_distribution::p
geometric_distribution::param
geometric_distribution::min
geometric_distribution::max
Não-membros funções
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Non-member functions
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operator==
operator!=
operator<<
operator>>
 
Defined in header <random>
template< class IntType = int >
class geometric_distribution;
(a partir do C++ 11)
Produz aleatória não negativa i valores inteiros, distribuídos de acordo com a função de probabilidade discreta:
Original:
Produces random non-negative integer values i, distributed according to discrete probability function:
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P(i|p) = p · (1 − p)i
O valor representa o número de sim / não ensaios (cada sucesso com p probabilidade) que são necessários para obter um único sucesso.
Original:
The value represents the number of yes/no trials (each succeeding with probability p) which are necessary to obtain a single success.
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std::geometric_distribution<>(p) é exatamente equivalente a std::negative_binomial_distribution<>(1, p). É também o homólogo discreto de std::exponential_distribution.
Original:
std::geometric_distribution<>(p) is exactly equivalent to std::negative_binomial_distribution<>(1, p). It is also the discrete counterpart of std::exponential_distribution.
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Índice

[editar] Tipos de membro

Tipo de membro
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Member type
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Definition
result_type IntType
param_type
o tipo do conjunto de parâmetros, não especificado
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the type of the parameter set, unspecified
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[editar] Funções de membro

constrói nova distribuição
Original:
constructs new distribution
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(função pública membro) [edit]
redefine o estado interno da distribuição
Original:
resets the internal state of the distribution
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(função pública membro) [edit]
Geração
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Generation
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gera o próximo número aleatório na distribuição
Original:
generates the next random number in the distribution
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(função pública membro) [edit]
Características
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Characteristics
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retorna o parâmetro de distribuição p (probabilidade de um true geração julgamento)
Original:
returns the p distribution parameter (probability of a trial generating true)
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(função pública membro) [edit]
obtém ou define o objeto de parâmetro de distribuição
Original:
gets or sets the distribution parameter object
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(função pública membro) [edit]
retorna o valor mínimo potencialmente gerado
Original:
returns the minimum potentially generated value
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(função pública membro) [edit]
retorna o valor máximo potencialmente gerado
Original:
returns the maximum potentially generated value
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(função pública membro) [edit]

[editar] Não-membros funções

compara dois objetos de distribuição
Original:
compares two distribution objects
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(função) [edit]
executa fluxo de entrada e saída em pseudo-aleatório distribuição de números
Original:
performs stream input and output on pseudo-random number distribution
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(função) [edit]

[editar] Exemplo

geometric_distribution <> (0,5) é o padrão e representa o número de moedas que são necessários para obter cabeças
Original:
geometric_distribution<>(0.5) is the default and represents the number of coin tosses that are required to get heads
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#include <iostream>
#include <iomanip>
#include <string>
#include <map>
#include <random>
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
 
    std::geometric_distribution<> d; // same as std::negative_binomial_distribution<> d(1, 0.5);
 
    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 *************************************************
1 *************************
2 ************
3 ******
4 **
5 *
6 
7 
8 
9 
10 
11

[editar] Links externos

Weisstein, Eric W. "Geometric Distribution." De MathWorld - Um recurso Web Wolfram.
Original:
Weisstein, Eric W. "Geometric Distribution." From MathWorld--A Wolfram Web Resource.
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