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std::normal_distribution

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< cpp‎ | numeric‎ | random

 
 
Numéricos biblioteca
Funciones matemáticas comunes
Floating-point medio ambiente
Los números complejos
Matrices numéricas
Pseudo-aleatoria de generación de números
En tiempo de compilación aritmética racional (C++11)
Genéricos operaciones numéricas
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Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
Pseudo-aleatoria de generación de números
Motores y 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)
Generadores
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Generators
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random_device(C++11)
Distribuciones
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Distributions
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Distribuciones 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)
Bernoulli distribuciones
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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 distribuciones
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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)
Distribuciones normales
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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)
Distribuciones de muestreo
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Sampling distributions
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discrete_distribution(C++11)
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piecewise_linear_distribution(C++11)
Secuencias de semillas
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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::normal_distribution
Las funciones miembro
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Member functions
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normal_distribution::normal_distribution
normal_distribution::reset
Generación
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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
Terceros funciones
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Non-member functions
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operator==
operator!=
operator<<
operator>>
 
Defined in header <random>
template< class RealType = double >
class normal_distribution;
(desde C++11)

Normal (o Guassian) distribución de números aleatorios:

f(x; μ,σ) = None
1
σ
exp

-
1
2


x-μ
σ


2


Con el decir μ y la desviación estándar (stddev') σ .
Original:
With the decir μ and the desviación estándar (stddev) σ.
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Contenido

[editar] Tipos de miembros

Miembro de tipo
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Member type
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Definition
result_type RealType
param_type
el tipo del conjunto de parámetros, sin especificar
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the type of the parameter set, unspecified
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[editar] Las funciones miembro

construye nueva distribución
Original:
constructs new distribution
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(miembro público función) [edit]
restablece el estado interno de la distribución
Original:
resets the internal state of the distribution
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(miembro público función) [edit]
Generación
Original:
Generation
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genera el siguiente número aleatorio en la distribución
Original:
generates the next random number in the distribution
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(miembro público función) [edit]
Características
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Characteristics
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devuelve la media (μ) parámetro de distribución
Original:
returns the mean (μ) distribution parameter
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(miembro público función) [edit]
devuelve la desviación estándar (σ) parámetro de distribución
Original:
returns the standard deviation (σ) distribution parameter
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(miembro público función) [edit]
obtiene o establece el objeto de parámetro de distribución
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gets or sets the distribution parameter object
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(miembro público función) [edit]
devuelve el valor mínimo potencialmente generado
Original:
returns the minimum potentially generated value
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(miembro público función) [edit]
devuelve el valor máximo potencialmente generado
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returns the maximum potentially generated value
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(miembro público función) [edit]

[editar] Terceros funciones

compara dos objetos de distribución
Original:
compares two distribution objects
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(función) [edit]
realiza flujo de entrada y salida en la distribución de números pseudo-aleatorios
Original:
performs stream input and output on pseudo-random number distribution
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(función) [edit]

[editar] Ejemplo

#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';
    }
}

Output:

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

[editar] Enlaces externos