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)

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.

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.

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:

Returns:

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:

Returns:

Definition at line 2214 of file tr1_impl/random.