libstdc++
|
A discrete Poisson random number distribution.
The formula for the Poisson probability density function is where is the parameter of the distribution.
typedef _IntType std::poisson_distribution< _IntType >::result_type |
result_type std::poisson_distribution< _IntType >::max | ( | ) | const [inline] |
Returns the least upper bound value of the distribution.
Definition at line 4058 of file random.h.
Referenced by std::binomial_distribution< _IntType >::operator()(), and std::poisson_distribution< _IntType >::operator()().
double std::poisson_distribution< _IntType >::mean | ( | ) | const [inline] |
result_type std::poisson_distribution< _IntType >::min | ( | ) | const [inline] |
result_type std::poisson_distribution< _IntType >::operator() | ( | _UniformRandomNumberGenerator & | __urng | ) | [inline] |
Generating functions.
Definition at line 4066 of file random.h.
References std::poisson_distribution< _IntType >::operator()(), and std::poisson_distribution< _IntType >::param().
Referenced by std::poisson_distribution< _IntType >::operator()().
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 1204 of file random.tcc.
References std::abs(), std::log(), and std::poisson_distribution< _IntType >::max().
param_type std::poisson_distribution< _IntType >::param | ( | ) | const [inline] |
Returns the parameter set of the distribution.
Definition at line 4036 of file random.h.
Referenced by std::poisson_distribution< _IntType >::operator()().
void std::poisson_distribution< _IntType >::param | ( | const param_type & | __param | ) | [inline] |
void std::poisson_distribution< _IntType >::reset | ( | ) | [inline] |
Resets the distribution state.
Definition at line 4022 of file random.h.
References std::normal_distribution< _RealType >::reset().
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
.
__os | An output stream. |
__x | A poisson_distribution random number distribution. |
__x
inserted or in an error state. bool operator== | ( | const std::poisson_distribution< _IntType1 > & | __d1, |
const std::poisson_distribution< _IntType1 > & | __d2 | ||
) | [friend] |
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
.
__is | An input stream. |
__x | A poisson_distribution random number generator engine. |
__x
extracted or in an error state.