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std::lognormal_distribution

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< cpp‎ | numeric‎ | random
 
 
 
Generación de números pseudoaleatorios
Motores y adaptadores de motor
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Engines and engine adaptors
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Generadores
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Generators
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Distribuciones
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Distributions
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Distribuciones uniformes
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Uniform distributions
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Bernoulli distribuciones
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Bernoulli distributions
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Poisson distribuciones
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Poisson distributions
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Distribuciones normales
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Normal distributions
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lognormal_distribution
(C++11)
Distribuciones de muestreo
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Sampling distributions
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Secuencias de semillas
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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::lognormal_distribution
Las funciones miembro
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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
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Non-member functions
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Definido en el archivo de encabezado <random>
template< class RealType = double >
class lognormal_distribution;
(desde C++11)
La distribución lognormal_distribution de números aleatorios genera números aleatorios x > 0 según una distribución log-normal:
Original:
The lognormal_distribution random number distribution produces random numbers x > 0 according to a log-normal distribution:
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f(x; m,s) = None
1
sx2 π
exp

- None
(ln x - m)2
2s2


El m parámetro es la media y el parámetro s la desviación estándar .
Original:
The parameter m is the mean and the parameter s the standard deviation.
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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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(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
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Characteristics
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devuelve la media (m) parámetro de distribución
Original:
returns the mean (m) distribution parameter
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(función miembro pública) [editar]
devuelve la desviación estándar (s) parámetro de distribución
Original:
returns the standard deviation (s) 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
Original:
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());
 
    std::lognormal_distribution<> d(1.6, 0.25);
 
    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 
 3 ***
 4 *************
 5 ***************
 6 *********
 7 ****
 8 *
 9 
10 
11 
12

[editar] Enlaces externos