NAME
std::tr1::exponential_distribution -
SYNOPSIS
Detailed Description
template<typename _RealType = double> class std::tr1::exponential_distribution< _RealType >
The formula for the exponential probability mass function is $ p(x) = \lambda e^{-\lambda x} $.
Mean$ ac{1}{\lambda} $ Median$ ac{\ln 2}{\lambda} $ Mode$ zero $ Range$[0, \infty]$ Standard Deviation$ ac{1}{\lambda} $ Distribution Statistics
Definition at line 2108 of file random.
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)
Constructor & Destructor Documentation
template<typename _RealType = double> std::tr1::exponential_distribution< _RealType >::exponential_distribution (const result_type & __lambda = result_type(1)) [inline, explicit]
Constructs an exponential distribution with inverse scale parameter $ \lambda $.
Definition at line 2121 of file random.
References _GLIBCXX_DEBUG_ASSERT.
Member Function Documentation
template<typename _RealType = double> _RealType std::tr1::exponential_distribution< _RealType >::lambda () const [inline]
Gets the inverse scale parameter of the distribution.
Definition at line 2131 of file random.
template<typename _RealType = double> void std::tr1::exponential_distribution< _RealType >::reset () [inline]
Resets the distribution.
Has no effect on exponential distributions.
Definition at line 2140 of file 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 2174 of file random.
Author
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