std::exponential_distribution

Langue: en

Version: 158459 (fedora - 05/07/09)

Section: 3 (Bibliothèques de fonctions)

Sommaire

NAME

std::exponential_distribution - An exponential continuous distribution for random numbers.

SYNOPSIS


Public Types


typedef _RealType input_type

typedef _RealType result_type

Public Member Functions


exponential_distribution (const result_type &__lambda=result_type(1))

_RealType lambda () const

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

void reset ()

Friends


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

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

Detailed Description

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

An exponential continuous distribution for random numbers.

The formula for the exponential probability mass function is $ p(x) =

e^{-
x} $.

Mean$ ac{1}{

} $ Median$ ac{
ge$[0, infty]$ Standard Deviation$ ac{1}{
} $ Distribution Statistics

Definition at line 2148 of file tr1_impl/random.

Constructor & Destructor Documentation

template<typename _RealType = double> std::exponential_distribution< _RealType >::exponential_distribution (const result_type & __lambda = result_type(1)) [inline, explicit]

Constructs an exponential distribution with inverse scale parameter $

$.

Definition at line 2161 of file tr1_impl/random.

Member Function Documentation

template<typename _RealType = double> _RealType std::exponential_distribution< _RealType >::lambda () const [inline]

Gets the inverse scale parameter of the distribution.

Definition at line 2171 of file tr1_impl/random.

template<typename _RealType = double> void std::exponential_distribution< _RealType >::reset () [inline]

Resets the distribution.

Has no effect on exponential distributions.

Definition at line 2180 of file tr1_impl/random.

template<typename _RealType = double> template<typename _RealType1 , typename _CharT , typename _Traits > std::basic_ostream<_CharT, _Traits>& operator<< (std::basic_ostream< _CharT, _Traits > & __os, const exponential_distribution< _RealType1 > & __x) [friend]

Inserts a exponential_distribution random number distribution __x into the output stream __os.

Parameters:

__os An output stream.
__x A exponential_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, exponential_distribution< _RealType > & __x) [friend]

Extracts a exponential_distribution random number distribution __x from the input stream __is.

Parameters:

__is An input stream.
__x A exponential_distribution random number generator engine.

Returns:

The input stream with __x extracted or in an error state.

Definition at line 2214 of file tr1_impl/random.

Author

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