std::lognormal_distribution

 

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accumulate

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La génération de nombres pseudo-aléatoires

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Générateurs Original: Generators 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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rand

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std::lognormal_distribution

Les fonctions membres Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

lognormal_distribution::lognormal_distribution

lognormal_distribution::reset

Génération Original: Generation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

lognormal_distribution::operator()

Caractéristiques Original: Characteristics The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

lognormal_distribution::param

lognormal_distribution::min

lognormal_distribution::max

Tiers fonctions Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

operator== operator!=

operator<< operator>>

 

Défini dans l'en-tête <random>
template< class RealType = double > class lognormal_distribution;		(depuis C++11)

La distribution du nombre de lognormal_distribution aléatoire produit des nombres aléatoires x > 0 selon une distribution log-normale:

Original:

The lognormal_distribution random number distribution produces random numbers x > 0 according to a log-normal distribution:

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f(x; m,s) = None

1

sx√2 π

exp⎛
⎜
⎝- None

(ln x - m)2

2s2

⎞
⎟
⎠

La m paramètre est la moyenne du paramètre et l'écart-type s .

Original:

The parameter m is the mean and the parameter s the standard deviation.

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Types de membres

Type de membre 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	RealType
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.

Les fonctions membres

(constructor)	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)
reset	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)
Génération Original: Generation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
operator()	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)
Caractéristiques Original: Characteristics The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
m	retourne le paramètre de distribution de moyenne (m) Original: returns the mean (m) 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)
s	renvoie le paramètre de l'écart-type de distribution (s) Original: returns the standard deviation (s) 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)
param	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)
min	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)
max	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)

Tiers fonctions

operator== operator!=	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)
operator<< operator>>	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)

Exemple

#include <iostream>
#include <iomanip>
#include <string>
#include <map>
#include <random>
#include <cmath>
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd());
 
    std::lognormal_distribution<> d(1.6, 0.25);
 
    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';
    }
}

Résultat :

2 
 3 ***
 4 *************
 5 ***************
 6 *********
 7 ****
 8 *
 9 
10 
11 
12

Liens externes

• Weisstein, Eric W. "Log Normal Distribution." De MathWorld - Une ressource Web Wolfram .

  Original:

  Weisstein, Eric W. "Log Normal Distribution." From MathWorld--A Wolfram Web Resource.

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• Log-normal distribution. Un article de Wikipédia .

  Original:

  Log-normal distribution. From Wikipedia.

  The text has been machine-translated via Google Translate.
  You can help to correct and verify the translation. Click here for instructions.