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std::normal_distribution

De cppreference.com
< cpp‎ | numeric‎ | random
 
 
 
Generación de números pseudoaleatorios
Motores y adaptadores de motor
Original:
Engines and engine adaptors
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Generadores
Original:
Generators
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Distribuciones
Original:
Distributions
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Distribuciones uniformes
Original:
Uniform distributions
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Bernoulli distribuciones
Original:
Bernoulli distributions
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Poisson distribuciones
Original:
Poisson distributions
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Distribuciones normales
Original:
Normal distributions
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normal_distribution
(C++11)
Distribuciones de muestreo
Original:
Sampling distributions
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Secuencias de semillas
Original:
Seed Sequences
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(C++11)
C biblioteca
Original:
C library
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std::normal_distribution
Las funciones miembro
Original:
Member functions
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Generación
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Generation
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Características
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Characteristics
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Terceros funciones
Original:
Non-member functions
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Definido en el archivo de encabezado <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
Original:
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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(función miembro pública) [editar]
restablece el estado interno de la distribución
Original:
resets the internal state of the distribution
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(función miembro pública) [editar]
Generación
Original:
Generation
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genera el siguiente número aleatorio en la distribución
(función miembro pública) [editar]
Características
Original:
Characteristics
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devuelve la media (μ) parámetro de distribución
Original:
returns the mean (μ) distribution parameter
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(función miembro pública) [editar]
devuelve la desviación estándar (σ) parámetro de distribución
Original:
returns the standard deviation (σ) distribution parameter
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(función miembro pública) [editar]
obtiene o establece el objeto de parámetro de distribución
Original:
gets or sets the distribution parameter object
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(función miembro pública) [editar]
devuelve el valor mínimo potencialmente generado
Original:
returns the minimum potentially generated value
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(función miembro pública) [editar]
devuelve el valor máximo potencialmente generado
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returns the maximum potentially generated value
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(función miembro pública) [editar]

[editar] Terceros funciones

compara dos objetos de distribución
(función) [editar]
realiza flujo de entrada y salida en la distribución de números pseudo-aleatorios
(función) [editar]

[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';
    }
}

Salida:

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

[editar] Enlaces externos