std::chi_squared_distribution
std::chi_squared_distribution
Defined in header <random> | ||
|---|---|---|
template< class RealType = double > class chi_squared_distribution; | (since C++11) |
The chi_squared_distribution produces random numbers x>0 according to the Chi-squared distribution: f(x;n) =
| x(n/2)-1 e-x/2 |
| Γ(n/2) 2n/2 |
Γ is the Gamma function (See also std::tgamma) and n are the degrees of freedom (default 1).
std::chi_squared_distribution satisfies all requirements of RandomNumberDistribution.
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. |
Member types
| Member type | Definition |
|---|---|
result_type | RealType |
param_type | the type of the parameter set, see RandomNumberDistribution. |
Member functions
| constructs new distribution (public member function) |
|
| resets the internal state of the distribution (public member function) |
|
Generation |
|
| generates the next random number in the distribution (public member function) |
|
Characteristics |
|
| returns the degrees of freedom (n) distribution parameter (public member function) |
|
| gets or sets the distribution parameter object (public member function) |
|
| returns the minimum potentially generated value (public member function) |
|
| returns the maximum potentially generated value (public member function) |
|
Non-member functions
| compares two distribution objects (function) |
|
| performs stream input and output on pseudo-random number distribution (function template) |
Example
External links
- Weisstein, Eric W. "Chi-Squared Distribution." From MathWorld--A Wolfram Web Resource.
- Chi-squared distribution. From Wikipedia.
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