bionic (3) std::poisson_distribution.3cxx.gz
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.
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::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 4337 of file random.h.
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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