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std::exponential_distribution

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C++
 
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)
piecewise_constant_distribution(C++11)
piecewise_linear_distribution(C++11)
Secuencias de semillas
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Seed Sequences
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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::exponential_distribution
Las funciones miembro
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Member functions
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exponential_distribution::exponential_distribution
exponential_distribution::reset
Generación
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Generation
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exponential_distribution::operator()
Características
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Characteristics
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exponential_distribution::lambda
exponential_distribution::param
exponential_distribution::min
exponential_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 exponential_distribution;
 (desde C++11)
Produce aleatorias no negativas valores de punto flotante x, distribuidos de acuerdo con función de densidad de probabilidad:
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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
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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
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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 el parámetro de la distribución lambda' (tipo de eventos)
Original:
returns the lambda distribution parameter (rate of events)
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(miembro público función) [edit]
obtiene o establece el objeto de parámetro de distribución
Original:
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
Original:
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>
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';
    }

Output: 

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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