Classes
struct	param_type

Public Types
typedef _RealType	result_type

Public Member Functions
	gamma_distribution (_RealType __alpha_val=_RealType(1), _RealType __beta_val=_RealType(1))

	gamma_distribution (const param_type &__p)

template<typename _ForwardIterator , typename _UniformRandomNumberGenerator >
void	__generate (_ForwardIterator __f, _ForwardIterator __t, _UniformRandomNumberGenerator &__urng)

template<typename _ForwardIterator , typename _UniformRandomNumberGenerator >
void	__generate (_ForwardIterator __f, _ForwardIterator __t, _UniformRandomNumberGenerator &__urng, const param_type &__p)

template<typename _UniformRandomNumberGenerator >
void	__generate (result_type __f, result_type __t, _UniformRandomNumberGenerator &__urng, const param_type &__p)

_RealType	alpha () const

_RealType	beta () const

result_type	max () const

result_type	min () const

template<typename _UniformRandomNumberGenerator >
gamma_distribution< _RealType > ::result_type	operator() (_UniformRandomNumberGenerator &__urng, const param_type &__param)

template<typename _UniformRandomNumberGenerator >
result_type	operator() (_UniformRandomNumberGenerator &__urng)

template<typename _UniformRandomNumberGenerator >
result_type	operator() (_UniformRandomNumberGenerator &__urng, const param_type &__p)

param_type	param () const

void	param (const param_type &__param)

void	reset ()

Friends
template<typename _RealType1 , typename _CharT , typename _Traits >
std::basic_ostream< _CharT, _Traits > &	operator<< (std::basic_ostream< _CharT, _Traits > &__os, const std::gamma_distribution< _RealType1 > &__x)

bool	operator== (const gamma_distribution &__d1, const gamma_distribution &__d2)

template<typename _RealType1 , typename _CharT , typename _Traits >
std::basic_istream< _CharT, _Traits > &	operator>> (std::basic_istream< _CharT, _Traits > &__is, std::gamma_distribution< _RealType1 > &__x)

Detailed Description

template<typename _RealType = double>
class std::gamma_distribution< _RealType >

A gamma continuous distribution for random numbers.

The formula for the gamma probability density function is:

$p(x|\alpha,\beta) = \frac{1}{\beta\Gamma(\alpha)} (x/\beta)^{\alpha - 1} e^{-x/\beta}$

Definition at line 2502 of file random.h.

Member Typedef Documentation

template<typename _RealType = double>

typedef _RealType std::gamma_distribution< _RealType >::result_type

The type of the range of the distribution.

Definition at line 2505 of file random.h.

Constructor & Destructor Documentation

template<typename _RealType = double>

std::gamma_distribution< _RealType >::gamma_distribution	(	_RealType	__alpha_val = `_RealType(1)`,
		_RealType	__beta_val = `_RealType(1)`
	)

inlineexplicit

Constructs a gamma distribution with parameters $\alpha$ and $\beta$ .

Definition at line 2554 of file random.h.

Member Function Documentation

template<typename _RealType = double>

_RealType std::gamma_distribution< _RealType >::alpha ( ) const

inline

Returns the $\alpha$ of the distribution.

Definition at line 2575 of file random.h.

template<typename _RealType = double>

_RealType std::gamma_distribution< _RealType >::beta ( ) const

inline

Returns the $\beta$ of the distribution.

Definition at line 2582 of file random.h.

template<typename _RealType = double>

result_type std::gamma_distribution< _RealType >::max ( ) const

inline

Returns the least upper bound value of the distribution.

Definition at line 2611 of file random.h.

template<typename _RealType = double>

result_type std::gamma_distribution< _RealType >::min ( ) const

inline

Returns the greatest lower bound value of the distribution.

Definition at line 2604 of file random.h.

template<typename _RealType = double>

template<typename _UniformRandomNumberGenerator >

gamma_distribution<_RealType>::result_type std::gamma_distribution< _RealType >::operator()	(	_UniformRandomNumberGenerator &	__urng,
		const param_type &	__param
	)

Marsaglia, G. and Tsang, W. W. "A Simple Method for Generating Gamma Variables" ACM Transactions on Mathematical Software, 26, 3, 363-372, 2000.

Definition at line 2489 of file bits/random.tcc.

References std::log(), and std::pow().

template<typename _RealType = double>

template<typename _UniformRandomNumberGenerator >

result_type std::gamma_distribution< _RealType >::operator() ( _UniformRandomNumberGenerator & __urng )

inline

Generating functions.

Definition at line 2619 of file random.h.

Referenced by std::gamma_distribution< result_type >::operator()().

template<typename _RealType = double>

param_type std::gamma_distribution< _RealType >::param ( ) const

inline

Returns the parameter set of the distribution.

Definition at line 2589 of file random.h.

template<typename _RealType = double>

void std::gamma_distribution< _RealType >::param ( const param_type & __param )

inline

Sets the parameter set of the distribution.

Parameters

__param The new parameter set of the distribution.

Definition at line 2597 of file random.h.

template<typename _RealType = double>

void std::gamma_distribution< _RealType >::reset ( )

inline

Resets the distribution state.

Definition at line 2568 of file random.h.

Referenced by std::chi_squared_distribution< _RealType >::reset(), std::fisher_f_distribution< _RealType >::reset(), std::student_t_distribution< _RealType >::reset(), and std::negative_binomial_distribution< _IntType >::reset().

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 std::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>

bool operator==	(	const gamma_distribution< _RealType > &	__d1,
		const gamma_distribution< _RealType > &	__d2
	)

friend

Return true if two gamma distributions have the same parameters and the sequences that would be generated are equal.

Definition at line 2655 of file random.h.

template<typename _RealType = double>

template<typename _RealType1 , typename _CharT , typename _Traits >

std::basic_istream<_CharT, _Traits>& operator>>	(	std::basic_istream< _CharT, _Traits > &	__is,
		std::gamma_distribution< _RealType1 > &	__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.

The documentation for this class was generated from the following files:

Classes

Public Types

Public Member Functions

Friends

Detailed Description

template<typename _RealType = double> class std::gamma_distribution< _RealType >

Member Typedef Documentation

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation

template<typename _RealType = double>
class std::gamma_distribution< _RealType >