std::chi_squared_distribution
From cppreference.com
| Defined in header <random>
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| 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/2Γ(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
Contents |
[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.
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[edit] Member types
| Member type | Definition |
result_type
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RealType |
param_type
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the type of the parameter set, see RandomNumberDistribution.
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[edit] 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) | |
[edit] Non-member functions
| compares two distribution objects (function) | |
| performs stream input and output on pseudo-random number distribution (function template) |
[edit] Example
| This section is incomplete Reason: no example |
[edit] External links
- Weisstein, Eric W. "Chi-Squared Distribution." From MathWorld--A Wolfram Web Resource.
- Chi-squared distribution. From Wikipedia.