std::exponential_distribution(3)std::exponential_distribution(3)NAMEstd::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) =
bda e^{-bda x} $.
Mean$ ac{1}{bda} $ Median$ ac{}}bda} $ Mode$ zero $ Range$[0, infty]$
Standard Deviation$ ac{1}{bda} $ 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 $ bda $.
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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libstdc++ 22 Nov 2013 std::exponential_distribution(3)
