std::normal_distribution
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template< class RealType = double > class normal_distribution; |
(depuis C++11) | |
Normal (ou gaussien) de distribution de nombres alatoires:
- f(x; ,) = None
exp1 2
-1 2 x-
2
Avec la moyenne et l'cart-type (' stddev) .
Original:
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Types de membres
| Type du membre | Dfinition |
result_type
|
RealType
|
param_type
|
le type du jeu de paramtres, sans prcision
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. |
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) | |
rinitialise l'tat 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. | |
gnre le nombre alatoire 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 paramtre de distribution de moyenne () Original: returns the mean () distribution parameter 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 le paramtre de l'cart-type de distribution () Original: returns the standard deviation () distribution parameter 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 dfinit l'objet de paramtre 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 gnres 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 gnres 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) | |
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'entre et de sortie sur la distribution de nombre pseudo-alatoire 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) | |
Exemple
#include <iostream>
#include <iomanip>
#include <string>
#include <map>
#include <random>
#include <cmath>
int main()
{
std::random_device rd;
std::mt19937 gen(rd());
// values near the mean are the most likely
// standard deviation affects the dispersion of generated values from the mean
std::normal_distribution<> d(5,2);
std::map<int, int> hist;
for(int n=0; n<10000; ++n) {
++hist[std::round(d(gen))];
}
for(auto p : hist) {
std::cout << std::fixed << std::setprecision(1) << std::setw(2)
<< p.first << ' ' << std::string(p.second/200, '*') << '\n';
}
}
Rsultat :
-2
-1
0
1 *
2 ***
3 ******
4 ********
5 **********
6 ********
7 *****
8 ***
9 *
10
11
12
Liens externes
- Weisstein, Eric W. "Normal Distribution." De MathWorld - Une ressource Web Wolfram .Original:Weisstein, Eric W. "Normal 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. - Distribution normale . Un article de Wikipdia .Original:Distribution normale . From Wikipedia.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.