Espacios de nombres
Variantes
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std::binomial_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
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Uniform distributions
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Bernoulli distribuciones
Original:
Bernoulli distributions
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binomial_distribution
(C++11)
Poisson distribuciones
Original:
Poisson distributions
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Distribuciones normales
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Normal distributions
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Distribuciones de muestreo
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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::binomial_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 IntType = int >
class binomial_distribution;
(desde C++11)
Produce aleatorio no negativo i valores enteros, distribuidos de acuerdo con función de probabilidad discreta:
Original:
Produces random non-negative integer values i, distributed according to discrete probability function:
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P(i|t,p) =

t
p


· pi
· (1 − p)t−i
El valor obtenido es el número de éxitos en una secuencia de t sí / no experimentos, cada uno de ellos tiene éxito con probabilidad p .
Original:
The value obtained is the number of successes in a sequence of t yes/no experiments, each of which succeeds with probability p.
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Contenido

[editar] Tipos de miembros

Miembro de tipo
Original:
Member type
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Definition
result_type IntType
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 t de distribución (número de ensayos)
Original:
returns the t distribution parameter (number of trials)
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(función miembro pública) [editar]
devuelve el parámetro p de distribución (probabilidad de un true generadora de ensayo)
Original:
returns the p distribution parameter (probability of a trial generating true)
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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

parcela de distribución binomial, con una probabilidad de éxito de cada ensayo exactamente 0,5, que ilustra la relación con el triángulo de Pascal (las probabilidades de que ninguno, 1, 2, 3, o los cuatro de los 4 ensayos tendrán éxito en este caso son 1:04 : 06:04:01)
Original:
plot of binomial distribution with probability of success of each trial exactly 0.5, illustrating the relationship with the pascal triangle (the probabilities that none, 1, 2, 3, or all four of the 4 trials will be successful in this case are 1:4:6:4:1)
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#include <iostream>
#include <iomanip>
#include <string>
#include <map>
#include <random>
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
    // perform 4 trials, each succeeds 1 in 2 times
    std::binomial_distribution<> d(4, 0.5);
 
    std::map<int, int> hist;
    for(int n=0; n<10000; ++n)
        ++hist[d(gen)];
    for(auto p : hist)
        std::cout << p.first <<
                ' ' << std::string(p.second/100, '*') << '\n';
}

Salida:

0 ******
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2 *************************************
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[editar] Enlaces externos

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