std::exponential_distribution< _RealType >

NAME

std::exponential_distribution< _RealType > − An exponential continuous distribution for random numbers.

SYNOPSIS

Classes

struct param_type

Public Types

typedef _RealType result_type

Public Member Functions

exponential_distribution (const result_type &__lambda=result_type(1))
Constructs an exponential distribution with inverse scale parameter $bda$.
exponential_distribution (const param_type &__p)
template<typename _ForwardIterator , typename _UniformRandomNumberGenerator > void __generate (_ForwardIterator __f, _ForwardIterator __t, _UniformRandomNumberGenerator &__urng)
template<typename _ForwardIterator , typename _UniformRandomNumberGenerator > void __generate (_ForwardIterator __f, _ForwardIterator __t, _UniformRandomNumberGenerator &__urng, const param_type &__p)
template<typename _UniformRandomNumberGenerator > void __generate (result_type *__f, result_type *__t, _UniformRandomNumberGenerator &__urng, const param_type &__p)
_RealType lambda () const
Returns the inverse scale parameter of the distribution.
result_type max () const
Returns the least upper bound value of the distribution.
result_type min () const
Returns the greatest lower bound value of the distribution.
template<typename _UniformRandomNumberGenerator > result_type operator() (_UniformRandomNumberGenerator &__urng)
Generating functions.
template<typename _UniformRandomNumberGenerator > result_type operator() (_UniformRandomNumberGenerator &__urng, const param_type &__p)
param_type param () const
Returns the parameter set of the distribution.
void param (const param_type &__param)
Sets the parameter set of the distribution.
void reset ()
Resets the distribution state.

Friends

bool operator== (const exponential_distribution &__d1, const exponential_distribution &__d2)
Return true if two exponential distributions have the same parameters.

Detailed Description

template<typename _RealType = double>
class std::exponential_distribution< _RealType >" An exponential continuous distribution for random numbers.

The formula for the exponential probability density function is $p(x|bda) = bda e^{-bda x}$.

Distribution StatisticsMean$ac{1}{bda}$ Median$ac{}}bda}$ Mode$zero$ Range$[0, infty]$ Standard Deviation$ac{1}{bda}$

Definition at line 4551 of file random.h.

Member Typedef Documentation

template<typename _RealType = double> typedef _RealType std::exponential_distribution< _RealType >::result_type
The type of the range of the distribution.

Definition at line 4554 of file random.h.

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 4594 of file random.h.

Member Function Documentation

template<typename _RealType = double> _RealType std::exponential_distribution< _RealType >::lambda () const [inline]
Returns the inverse scale parameter of the distribution.

Definition at line 4615 of file random.h.

template<typename _RealType = double> result_type std::exponential_distribution< _RealType >::max () const [inline]
Returns the least upper bound value of the distribution.

Definition at line 4644 of file random.h.

References std::numeric_limits< _Tp >::max().

template<typename _RealType = double> result_type std::exponential_distribution< _RealType >::min () const [inline]
Returns the greatest lower bound value of the distribution.

Definition at line 4637 of file random.h.

template<typename _RealType = double> template<typename _UniformRandomNumberGenerator > result_type std::exponential_distribution< _RealType >::operator() (_UniformRandomNumberGenerator & __urng) [inline]
Generating functions.

Definition at line 4652 of file random.h.

References std::log().

template<typename _RealType = double> param_type std::exponential_distribution< _RealType >::param () const [inline]
Returns the parameter set of the distribution.

Definition at line 4622 of file random.h.

Referenced by std::operator>>().

template<typename _RealType = double> void std::exponential_distribution< _RealType >::param (const param_type & __param) [inline]
Sets the parameter set of the distribution.

Parameters:

__param The new parameter set of the distribution.

Definition at line 4630 of file random.h.

template<typename _RealType = double> void std::exponential_distribution< _RealType >::reset () [inline]
Resets the distribution state. Has no effect on exponential distributions.

Definition at line 4609 of file random.h.

Friends And Related Function Documentation

template<typename _RealType = double> bool operator== (const exponential_distribution< _RealType > & __d1, const exponential_distribution< _RealType > & __d2) [friend]
Return true if two exponential distributions have the same parameters.

Definition at line 4692 of file random.h.

Author

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