std::exponential_distribution< _RealType > Class Template Reference
[Continuous Distributions]

An exponential continuous distribution for random numbers. More...

List of all members.

Public Types

Public Member Functions

Friends


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) = \lambda e^{-\lambda x} $.

Distribution Statistics
Mean$ \frac{1}{\lambda} $
Median$ \frac{\ln 2}{\lambda} $
Mode$ zero $
Range$[0, \infty]$
Standard Deviation$ \frac{1}{\lambda} $

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 $ \lambda $.

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.


The documentation for this class was generated from the following file:

Generated on Thu Jul 23 21:17:50 2009 for libstdc++ by  doxygen 1.5.8