poisson_distribution::mean

Retourne le paramètre moyen de distribution.

RealType mean() const;

Notes

La fonction membre retourne la valeur signalée stored_mean.

Exemple

// std_tr1__random__poisson_distribution_mean.cpp 
// compile with: /EHsc 
#include <random> 
#include <iostream> 
 
typedef std::mt19937 Myeng; 
typedef std::poisson_distribution<int, double> Mydist; 
int main() 
    { 
    Myeng eng; 
    Mydist dist(3.5); 
    Mydist::input_type engval = eng(); 
    Mydist::result_type distval = dist(eng); 
 
    distval = distval;  // to quiet "unused" warnings 
    engval = engval; 
 
    std::cout << "mean == " << dist.mean() << std::endl; 
 
    dist.reset(); // discard any cached values 
    std::cout << "a random value == " << dist(eng) << std::endl; 
    std::cout << "a random value == " << dist(eng) << std::endl; 
    std::cout << "a random value == " << dist(eng) << std::endl; 
 
    return (0); 
    } 
 

Configuration requise

en-tête : <random>

l'espace de noms : DST

Voir aussi

Référence

<random>

poisson_distribution Class