std::geometric_distribution
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| Definido en el archivo de encabezado <random>
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| 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.The text has been machine-translated via Google Translate.
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[editar] Tipos de miembros
| Miembro de tipo
Original: Member type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Definition |
result_type
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IntType |
param_type
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el tipo del conjunto de parámetros, sin especificar
Original: the type of the parameter set, unspecified The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[editar] Las funciones miembro
| construye nueva distribución Original: constructs new distribution The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función miembro pública) | |
| restablece el estado interno de la distribución Original: resets the internal state of the distribution The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función miembro pública) | |
Original: Generation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | |
| genera el siguiente número aleatorio en la distribución (función miembro pública) | |
Original: Characteristics The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | |
| 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) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función miembro pública) | |
| obtiene o establece el objeto de parámetro de distribución Original: gets or sets the distribution parameter object The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función miembro pública) | |
| devuelve el valor mínimo potencialmente generado Original: returns the minimum potentially generated value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función miembro pública) | |
| devuelve el valor máximo potencialmente generado Original: returns the maximum potentially generated value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función miembro pública) | |
[editar] Terceros funciones
| compara dos objetos de distribución (función) | |
| realiza flujo de entrada y salida en la distribución de números pseudo-aleatorios (función) |
[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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Ejecuta este código
#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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