std::gamma_distribution< _RealType >(3cxx) | std::gamma_distribution< _RealType >(3cxx) |
NAME¶
std::gamma_distribution< _RealType > -SYNOPSIS¶
Public Types¶
typedef _RealType input_type
Public Member Functions¶
_RealType alpha () const
Friends¶
template<typename _RealType1 , typename _CharT , typename _Traits > std::basic_ostream< _CharT,
Detailed Description¶
template<typename _RealType = double>class std::gamma_distribution< _RealType >¶
A gamma continuous distribution for random numbers.Constructor & Destructor Documentation¶
template<typename _RealType = double> std::gamma_distribution< _RealType >:: gamma_distribution (const result_type &__alpha_val = result_type(1)) [inline], [explicit]¶
Constructs a gamma distribution with parameters $ alpha $. Definition at line 2332 of file tr1_impl/random.Member Function Documentation¶
template<typename _RealType = double> _RealType std::gamma_distribution< _RealType >::alpha () const [inline]¶
Gets the $ alpha $ of the distribution. Definition at line 2343 of file tr1_impl/random.template<typename _RealType > template<class _UniformRandomNumberGenerator > gamma_distribution< _RealType >::result_type std::gamma_distribution< _RealType >::operator() (_UniformRandomNumberGenerator &__urng)¶
Cheng's rejection algorithm GB for alpha >= 1 and a modification of Vaduva's rejection from Weibull algorithm due to Devroye for alpha < 1. References: Cheng, R. C. 'The Generation of Gamma Random Variables with Non-integral Shape Parameter.' Applied Statistics, 26, 71-75, 1977. Vaduva, I. 'Computer Generation of Gamma Gandom Variables by Rejection and Composition Procedures.' Math. Operationsforschung and Statistik, Series in Statistics, 8, 545-576, 1977. Devroye, L. 'Non-Uniform Random Variates Generation.' Springer-Verlag, New York, 1986, Ch. IX, Sect. 3.4 (+ Errata!). Definition at line 1501 of file random.tcc. References std::exp(), std::log(), and std::pow().template<typename _RealType = double> void std::gamma_distribution< _RealType >::reset () [inline]¶
Resets the distribution. Definition at line 2350 of file tr1_impl/random.Friends And Related Function Documentation¶
template<typename _RealType = double> template<typename _RealType1 , typename _CharT , typename _Traits > std::basic_ostream<_CharT, _Traits>& operator<< ( std::basic_ostream< _CharT, _Traits > &__os, const gamma_distribution< _RealType1 > &__x) [friend]¶
Inserts a gamma_distribution random number distribution __x into the output stream __os. Parameters:__os An output stream.
__x A gamma_distribution random number distribution.
Returns:
The output stream with the state of __x
inserted or in an error state.
template<typename _RealType = double> template<typename _CharT , typename _Traits > std::basic_istream<_CharT, _Traits>& operator>> ( std::basic_istream< _CharT, _Traits > &__is, gamma_distribution< _RealType > &__x) [friend]¶
Extracts a gamma_distribution random number distribution __x from the input stream __is. Parameters:__is An input stream.
__x A gamma_distribution random number generator engine.
Returns:
The input stream with __x extracted or in an
error state.
Author¶
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