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std::lognormal_distribution - cppreference.com
std::lognormal_distribution
template< class RealType = double >
class lognormal_distribution;
(since C++11)
The lognormal_distribution random number distribution produces random numbers x > 0 according to a Log-normal distribution:
-
\({\small f(x;m,s) = \frac{1}{sx\sqrt{2\pi} } \exp{(-\frac{ {(\ln{x} - m)}^{2} }{2{s}^{2} })} }\)f(x; m,s) = expâ
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The parameters m and s are, respectively, the mean and standard deviation of the natural logarithm of x.
std::lognormal_distribution satisfies all requirements of RandomNumberDistribution.
[edit] Template parameters RealType - The result type generated by the generator. The effect is undefined if this is not one of float, double, or long double. [edit] Member types Member type Definition result_type (C++11) RealType param_type (C++11) the type of the parameter set, see RandomNumberDistribution. [edit] Member functions constructs new distribution
(public member function) [edit] resets the internal state of the distribution
(public member function) [edit] Generation generates the next random number in the distribution
(public member function) [edit] Characteristics returns the distribution parameters
(public member function) [edit] gets or sets the distribution parameter object
(public member function) [edit] returns the minimum potentially generated value
(public member function) [edit] returns the maximum potentially generated value
(public member function) [edit] [edit] Non-member functions [edit] Example
Possible output:
2
3 ***
4 *************
5 ***************
6 *********
7 ****
8 *
9
a
b
c
[edit] External links
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