normal_distribution::sigma

Returns the sigma distribution parameter.

result_type sigma() const;

Remarks

The member function returns the stored value stored_sigma.

Example

// std_tr1__random__normal_distribution_sigma.cpp 
// compile with: /EHsc 
#include <random> 
#include <iostream> 
 
typedef std::ranlux64_base_01 Myeng; 
typedef std::normal_distribution<double> Mydist; 
int main() 
    { 
    Myeng eng; 
    Mydist dist(1.5, 2.0); 
    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; 
    std::cout << "sigma == " << dist.sigma() << 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); 
    } 
 

mean == 1.5
sigma == 2
a random value == 0.0275648
a random value == 0.0738393
a random value == 4.47125

Requirements

Header: <random>

Namespace: std

See Also

Reference

<random>

normal_distribution Class

normal_distribution::mean

Other Resources

<random> Members