std::poisson_distribution
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| Déclaré dans l'en-tête <random>
|
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| template< class IntType = int > class poisson_distribution; |
(depuis C++11) | |
Produit aléatoire non négative i valeurs entières, réparties selon la fonction de probabilité discrète:
Original:
Produces random non-negative integer values i, distributed according to discrete probability function:
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- P(i|μ) =
e-μ
·μii!
The value obtained is the probability of exactly i occurrences of a random event if the expected, mean number of its occurrence under the same conditions (on the same time/space interval) is μ.
[modifier] Types de membres
| Type du membre | Définition |
result_type
|
IntType |
param_type
|
le type du jeu de paramètres, sans précision
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. |
[modifier] Fonctions membres
| construit distribution 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. (fonction membre publique) | |
| réinitialise l'état interne de la distribution 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. (fonction membre publique) | |
Original: Generation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | |
| génère le nombre aléatoire suivant dans la distribution Original: generates the next random number in the distribution The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre publique) | |
Original: Characteristics The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. | |
| retourne le signifie paramètre de distribution (nombre moyen d'occurrences de l'événement) Original: returns the mean distribution parameter (mean number of occurrences of the event) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre publique) | |
| obtient ou définit l'objet de paramètre de distribution 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. (fonction membre publique) | |
| renvoie la valeur minimale potentiellement générées 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. (fonction membre publique) | |
| renvoie la valeur maximale potentiellement générées 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. (fonction membre publique) | |
[modifier] Fonctions annexes
| compare deux objets de distribution Original: compares two distribution objects The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) | |
| effectue flux d'entrée et de sortie sur la distribution de nombre pseudo-aléatoire Original: performs stream input and output on pseudo-random number distribution The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) | |
[modifier] Exemple
#include <iostream> #include <iomanip> #include <string> #include <map> #include <random> int main() { std::random_device rd; std::mt19937 gen(rd()); // if an event occurs 4 times a minute on average // how often is it that it occurs n times in one minute? std::poisson_distribution<> d(4); 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'; } }
Résultat :
0 * 1 ******* 2 ************** 3 ******************* 4 ******************* 5 *************** 6 ********** 7 ***** 8 ** 9 * 10 11 12 13
[modifier] Liens externes
Weisstein, Eric W. "Poisson Distribution." De MathWorld - Une ressource Web Wolfram .
Original:
Weisstein, Eric W. "Poisson Distribution." From MathWorld--A Wolfram Web Resource.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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