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std::exponential_distribution Class Reference
Poisson Distributions

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Detailed Description

An exponential continuous distribution for random numbers.

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

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

Member Typedef Documentation

typedef _RealType std::exponential_distribution::result_type

The type of the range of the distribution.

Definition at line 4152 of file random.h.

Constructor & Destructor Documentation

std::exponential_distribution::exponential_distribution ( const result_type &  __lambda = result_type(1)) [inline, explicit]

Constructs an exponential distribution with inverse scale parameter $\lambda$.

Definition at line 4183 of file random.h.

Member Function Documentation

_RealType std::exponential_distribution::lambda ( ) const [inline]

Returns the inverse scale parameter of the distribution.

Definition at line 4204 of file random.h.

result_type std::exponential_distribution::max ( ) const [inline]

Returns the least upper bound value of the distribution.

Definition at line 4233 of file random.h.

result_type std::exponential_distribution::min ( ) const [inline]

Returns the greatest lower bound value of the distribution.

Definition at line 4226 of file random.h.

template<typename _UniformRandomNumberGenerator >
result_type std::exponential_distribution::operator() ( _UniformRandomNumberGenerator &  __urng) [inline]

Generating functions.

Definition at line 4241 of file random.h.

References operator()(), and param().

Referenced by operator()().

param_type std::exponential_distribution::param ( ) const [inline]

Returns the parameter set of the distribution.

Definition at line 4211 of file random.h.

Referenced by operator()(), std::operator==(), and std::operator>>().

void std::exponential_distribution::param ( const param_type &  __param) [inline]

Sets the parameter set of the distribution.

Parameters:
__paramThe new parameter set of the distribution.

Definition at line 4219 of file random.h.

void std::exponential_distribution::reset ( ) [inline]

Resets the distribution state.

Has no effect on exponential distributions.

Definition at line 4198 of file random.h.

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