Espacios de nombres
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std::exponential_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
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Bernoulli distributions
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Poisson distribuciones
Original:
Poisson distributions
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exponential_distribution
(C++11)
Distribuciones normales
Original:
Normal distributions
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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::exponential_distribution
Las funciones miembro
Original:
Member functions
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Generación
Original:
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 exponential_distribution;
(desde C++11)
Produce aleatorias no negativas valores de punto flotante x, distribuidos de acuerdo con función de densidad de probabilidad:
Original:
Produces random non-negative floating-point values x, distributed according to probability density function:
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P(x|λ) = λe-λx
El valor obtenido es el tiempo / distancia hasta el siguiente evento al azar si se producen sucesos aleatorios a velocidad constante λ por unidad de tiempo / distancia. Por ejemplo, esta distribución se describe el tiempo entre los clics de un contador Geiger o la distancia entre las mutaciones de punto en una cadena de ADN .
Original:
The value obtained is the time/distance until the next random event if random events occur at constant rate λ per unit of time/distance. For example, this distribution describes the time between the clicks of a Geiger counter or the distance between point mutations in a DNA strand.
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Esta es la contraparte continua de std::geometric_distribution
Original:
This is the continuous counterpart of std::geometric_distribution
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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
Original:
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 el parámetro de la distribución lambda' (tipo de eventos)
Original:
returns the lambda distribution parameter (rate of events)
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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>
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
 
    // if particles decay once per second on average,
    // how much time, in seconds, until the next one?
    std::exponential_distribution<> d(1);
 
    std::map<int, int> hist;
    for(int n=0; n<10000; ++n) {
        ++hist[2*d(gen)];
    }
    for(auto p : hist) {
        std::cout << std::fixed << std::setprecision(1) 
                  << p.first/2.0 << '-' << (p.first+1)/2.0 <<
                ' ' << std::string(p.second/200, '*') << '\n';
    }

Salida:

0.0-0.5 *******************
0.5-1.0 ***********
1.0-1.5 *******
1.5-2.0 ****
2.0-2.5 **
2.5-3.0 *
3.0-3.5 
3.5-4.0

[editar] Enlaces externos

Weisstein, Eric W. "Exponential Distribution." De MathWorld - Un recurso del Web Wolfram .
Original:
Weisstein, Eric W. "Exponential Distribution." From MathWorld--A Wolfram Web Resource.
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