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std::exponential_distribution.3cxx
Langue: en
Version: 293195 (debian - 07/07/09)
Section: 3 (Bibliothèques de fonctions)
Sommaire
- NAME
- SYNOPSIS
- Detailed Description
- Constructor & Destructor Documentation
- Member Function Documentation
- 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 exponential_distribution< _RealType1 > & __x) [friend]
- 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]
- Author
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.
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 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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