NAME¶

std::poisson_distribution< _IntType > -

SYNOPSIS¶

Classes¶

struct param_type

Public Types¶

typedef _IntType result_type

Public Member Functions¶

poisson_distribution (double __mean=1.0) poisson_distribution (const param_type &__p) result_type max () const double mean () const result_type min () const template<typename _UniformRandomNumberGenerator > result_type operator() (_UniformRandomNumberGenerator &__urng) template<typename _UniformRandomNumberGenerator > result_type operator() (_UniformRandomNumberGenerator &__urng, const param_type &__p) param_type param () const void param (const param_type &__param) void reset ()

Friends¶

template<typename _IntType1 , typename _CharT , typename _Traits > std::basic_ostream< _CharT, _Traits > & operator<< (std::basic_ostream< _CharT, _Traits > &__os, const std::poisson_distribution< _IntType1 > &__x)" bool operator== (const poisson_distribution &__d1, const poisson_distribution &__d2) template<typename _IntType1 , typename _CharT , typename _Traits > std::basic_istream< _CharT, _Traits > & operator>> (std::basic_istream< _CharT, _Traits > &__is, std::poisson_distribution< _IntType1 > &__x)"

Detailed Description¶

template<typename _IntType = int>class std::poisson_distribution< _IntType >¶

A discrete Poisson random number distribution. The formula for the Poisson probability density function is $p(i|) = ac{^i}{i!} e^{-}$ where $$ is the parameter of the distribution. Definition at line 3957 of file random.h.

Member Typedef Documentation¶

template<typename _IntType = int> typedef _IntType std::poisson_distribution< _IntType >:: result_type¶

The type of the range of the distribution. Definition at line 3960 of file random.h.

Member Function Documentation¶

template<typename _IntType = int> result_type std::poisson_distribution< _IntType >::max () const [inline]¶

Returns the least upper bound value of the distribution. Definition at line 4051 of file random.h. References std::numeric_limits< _Tp >::max().

template<typename _IntType = int> double std::poisson_distribution< _IntType >::mean () const [inline]¶

Returns the distribution parameter mean. Definition at line 4022 of file random.h.

template<typename _IntType = int> result_type std::poisson_distribution< _IntType >::min () const [inline]¶

Returns the greatest lower bound value of the distribution. Definition at line 4044 of file random.h.

template<typename _IntType = int> template<typename _UniformRandomNumberGenerator > result_type std::poisson_distribution< _IntType >::operator() (_UniformRandomNumberGenerator &__urng) [inline]¶

Generating functions. Definition at line 4059 of file random.h. References std::poisson_distribution< _IntType >::operator()(), and std::poisson_distribution< _IntType >::param(). Referenced by std::poisson_distribution< _IntType >::operator()().

template<typename _IntType > template<typename _UniformRandomNumberGenerator > poisson_distribution< _IntType >:: result_type std::poisson_distribution< _IntType >::operator() (_UniformRandomNumberGenerator &__urng, const param_type &__param)¶

A rejection algorithm when mean >= 12 and a simple method based upon the multiplication of uniform random variates otherwise. NB: The former is available only if _GLIBCXX_USE_C99_MATH_TR1 is defined. Reference: Devroye, L. Non-Uniform Random Variates Generation. Springer-Verlag, New York, 1986, Ch. X, Sects. 3.3 & 3.4 (+ Errata!). Definition at line 1228 of file random.tcc. References std::abs(), std::numeric_limits< _Tp >::epsilon(), std::log(), and std::numeric_limits< _Tp >::max().

template<typename _IntType = int> param_type std::poisson_distribution< _IntType >::param () const [inline]¶

Returns the parameter set of the distribution. Definition at line 4029 of file random.h. Referenced by std::poisson_distribution< _IntType >::operator()().

template<typename _IntType = int> void std::poisson_distribution< _IntType >::param (const param_type &__param) [inline]¶

Sets the parameter set of the distribution. Parameters: Definition at line 4037 of file random.h.

template<typename _IntType = int> void std::poisson_distribution< _IntType >::reset () [inline]¶

Resets the distribution state. Definition at line 4015 of file random.h. References std::normal_distribution< _RealType >::reset().

Friends And Related Function Documentation¶

template<typename _IntType = int> template<typename _IntType1 , typename _CharT , typename _Traits > std::basic_ostream<_CharT, _Traits>& operator<< ( std::basic_ostream< _CharT, _Traits > &__os, const std::poisson_distribution< _IntType1 > &__x) [friend]¶

Inserts a poisson_distribution random number distribution __x into the output stream __os. Parameters: Returns:

template<typename _IntType = int> bool operator== (const poisson_distribution< _IntType > &__d1, const poisson_distribution< _IntType > &__d2) [friend]¶

Return true if two Poisson distributions have the same parameters and the sequences that would be generated are equal. Definition at line 4073 of file random.h.

template<typename _IntType = int> template<typename _IntType1 , typename _CharT , typename _Traits > std::basic_istream<_CharT, _Traits>& operator>> ( std::basic_istream< _CharT, _Traits > &__is, std::poisson_distribution< _IntType1 > &__x) [friend]¶

Extracts a poisson_distribution random number distribution __x from the input stream __is. Parameters: Returns:

Author¶

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