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      std::normal_distribution

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      < cpp‎ | numeric‎ | random

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      C++
       
      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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      (C++11)
       
      Pseudo-aleatório de geração de números
      Motores e adaptadores de motor
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      Engines and engine adaptors
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      (C++11)
      (C++11)
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      (C++11)
      Geradores
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      Generators
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      (C++11)
      Distribuições
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      Distributions
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      Distribuições uniformes
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      Uniform distributions
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      (C++11)
      (C++11)
      (C++11)
      Distribuições de Bernoulli
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      Bernoulli distributions
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      Distribuições de Poisson
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      Poisson distributions
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      (C++11)
      (C++11)
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      Distribuições normais
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      Normal distributions
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      normal_distribution
      (C++11)
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      Distribuições de amostragem
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      Sampling distributions
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      (C++11)
      (C++11)
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      Seqüências de sementes
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      Seed Sequences
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      (C++11)
      C biblioteca
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      C library
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      std::normal_distribution
      Funções de membro
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      Member functions
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      normal_distribution::normal_distribution
      normal_distribution::reset
      Geração
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      Generation
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      normal_distribution::operator()
      Características
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      Characteristics
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      normal_distribution::mean
      normal_distribution::stddev
      normal_distribution::param
      normal_distribution::min
      normal_distribution::max
      Não-membros funções
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      Non-member functions
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      Definido no cabeçalho <random>
      template<class RealType =double>
      class normal_distribution;
      		(desde C++11)

      Normal (ou guassian) a distribuição de números aleatórios:

      f(x; μ,σ) = None
      1
      σ√2π
       exp⎛
      ⎜
      ⎝      -
      1
      2
      ⎛
      ⎜
      ⎝
      x-μ
      σ
      ⎞
      ⎟
      ⎠      2
      ⎞
      ⎟
      ⎠
      Com a dizerμ eo desvio padrão (' stddev) σ.
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      With the dizerμ and the desvio padrão (stddev) σ.
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      Índice

      [editar]Tipos de membro

      Tipo de membro
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      Member type
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      		 Definition
      result_typeRealType
      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
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      constructs new distribution
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      (função pública membro)[edit]
      redefine o estado interno da distribuição
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      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
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      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 médio de distribuição (μ)
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      returns the mean (μ) distribution parameter
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      (função pública membro)[edit]
      retorna o desvio padrão do parâmetro de distribuição (σ)
      Original:
      returns the standard deviation (σ) distribution parameter
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      (função pública membro)[edit]
      obtém ou define o objeto de parâmetro de distribuição
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      gets or sets the distribution parameter object
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      (função pública membro)[edit]
      retorna o valor mínimo potencialmente gerado
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      returns the minimum potentially generated value
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      (função pública membro)[edit]
      retorna o valor máximo potencialmente gerado
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      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

      #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';}}

      Saída: 

      -2 -1 0 1 * 2 *** 3 ****** 4 ******** 5 ********** 6 ******** 7 ***** 8 *** 9 * 10 11 12

      [editar]Links externos

      Obtida de "https://pt.cppreference.com/mwiki/index.php?title=cpp/numeric/random/normal_distribution&oldid=21442"
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