Provided by: libstdc++-5-doc_5.4.0-6ubuntu1~16.04.12_all
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) 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) 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 4265 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 4268 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 4359 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 4330 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 4352 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 4367 of file random.h. Referenced by std::negative_binomial_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 1284 of file bits/random.tcc. References std::abs(), std::numeric_limits< _Tp >::epsilon(), std::exp(), std::ios_base::flags(), std::left(), std::log(), std::numeric_limits< _Tp >::max(), std::max(), std::binomial_distribution< _IntType >::operator()(), std::__detail::operator>>(), std::poisson_distribution< _IntType >::param(), std::scientific(), std::skipws(), and std::sqrt(). template<typename _IntType = int> param_type std::poisson_distribution< _IntType >::param () const [inline] Returns the parameter set of the distribution. Definition at line 4337 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: __param The new parameter set of the distribution. Definition at line 4345 of file random.h. template<typename _IntType = int> void std::poisson_distribution< _IntType >::reset () [inline] Resets the distribution state. Definition at line 4323 of file random.h.
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: __os An output stream. __x A poisson_distribution random number distribution. Returns: The output stream with the state of __x inserted or in an error state. 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 4403 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: __is An input stream. __x A poisson_distribution random number generator engine. Returns: The input stream with __x extracted or in an error state.
Author
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