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      std::piecewise_linear_distribution

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      < cpp‎ | numeric‎ | random

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      C++
       
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      Generic numeric operations
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      Pseudo-aleatório de geração de números
      Motores e adaptadores de motor
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      Engines and engine adaptors
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      Geradores
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      Generators
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      Distribuições
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      Distributions
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      Distribuições uniformes
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      Uniform distributions
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      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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      Distribuições normais
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      Normal distributions
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      Distribuições de amostragem
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      piecewise_linear_distribution
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      Seqüências de sementes
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      Seed Sequences
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      C biblioteca
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      C library
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      std::piecewise_linear_distribution
      Funções de membro
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      Member functions
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      piecewise_linear_distribution::piecewise_linear_distribution
      piecewise_linear_distribution::reset
      Geração
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      Generation
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      piecewise_linear_distribution::operator()
      Características
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      Characteristics
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      piecewise_linear_distribution::param
      piecewise_linear_distribution::min
      piecewise_linear_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 piecewise_linear_distribution;
      		(desde 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.

      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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      obtém a lista de limites de intervalo
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      obtains the list of interval boundaries
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      (função pública membro)[edit]
      obtém a lista de densidades de probabilidade nos limites de intervalo
      Original:
      obtains the list of probability densities at interval boundaries
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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

      #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 ratestd::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, }}

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