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std::geometric_distribution

De cppreference.com
< cpp‎ | numeric‎ | random

 
 
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
Original:
Generic numeric operations
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(C++11)
 
Pseudo-aleatoria de generación de números
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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geometric_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
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Seed Sequences
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(C++11)
C biblioteca
Original:
C library
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std::geometric_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 la cabecera <random>
template< class IntType = int >
class geometric_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|p) = p · (1 − p)i
El valor representa el número de ensayos sí / no (cada éxito con p probabilidad) que son necesarios para obtener un solo éxito .
Original:
The value represents the number of yes/no trials (each succeeding with probability p) which are necessary to obtain a single success.
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std::geometric_distribution<>(p) es exactamente equivalente a std::negative_binomial_distribution<>(1, p). También es la contrapartida discreta de std::exponential_distribution .
Original:
std::geometric_distribution<>(p) is exactly equivalent to std::negative_binomial_distribution<>(1, p). It is also the discrete counterpart of std::exponential_distribution.
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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 público) [editar]
restablece el estado interno de la distribución
Original:
resets the internal state of the distribution
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(función miembro público) [editar]
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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(función miembro público) [editar]
Características
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Characteristics
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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 público) [editar]
obtiene o establece el objeto de parámetro de distribución
Original:
gets or sets the distribution parameter object
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(función miembro público) [editar]
devuelve el valor mínimo potencialmente generado
Original:
returns the minimum potentially generated value
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(función miembro público) [editar]
devuelve el valor máximo potencialmente generado
Original:
returns the maximum potentially generated value
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(función miembro público) [editar]

[editar] Terceros funciones

compara dos objetos de distribución
Original:
compares two distribution objects
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(función) [editar]
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) [editar]

[editar] Ejemplo

geometric_distribution <> (0,5) es el valor predeterminado, y representa el número de lanzamientos de moneda que se requieren para obtener cabezas
Original:
geometric_distribution<>(0.5) is the default and represents the number of coin tosses that are required to get heads
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#include <iostream>
#include <iomanip>
#include <string>
#include <map>
#include <random>
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
 
    std::geometric_distribution<> d; // same as std::negative_binomial_distribution<> d(1, 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 *************************************************
1 *************************
2 ************
3 ******
4 **
5 *
6 
7 
8 
9 
10 
11

[editar] Enlaces externos

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