libstdc++
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Public Types | |
typedef _RealType | input_type |
typedef _IntType | result_type |
Public Member Functions | |
binomial_distribution (_IntType __t=1, const _RealType &__p=_RealType(0.5)) | |
template<class _UniformRandomNumberGenerator > | |
result_type | operator() (_UniformRandomNumberGenerator &__urng) |
_RealType | p () const |
void | reset () |
_IntType | t () const |
Friends | |
template<typename _IntType1 , typename _RealType1 , typename _CharT , typename _Traits > | |
std::basic_ostream< _CharT, _Traits > & | operator<< (std::basic_ostream< _CharT, _Traits > &__os, const binomial_distribution< _IntType1, _RealType1 > &__x) |
template<typename _IntType1 , typename _RealType1 , typename _CharT , typename _Traits > | |
std::basic_istream< _CharT, _Traits > & | operator>> (std::basic_istream< _CharT, _Traits > &__is, binomial_distribution< _IntType1, _RealType1 > &__x) |
A discrete binomial random number distribution.
The formula for the binomial probability mass function is
where
and
are the parameters of the distribution.
Definition at line 1951 of file tr1_impl/random.
binomial_distribution< _IntType, _RealType >::result_type std::binomial_distribution< _IntType, _RealType >::operator() | ( | _UniformRandomNumberGenerator & | __urng | ) |
A rejection algorithm when t * p >= 8 and a simple waiting time method - the second in the referenced book - 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, Sect. 4 (+ Errata!).
Definition at line 1161 of file random.tcc.
References std::abs(), std::log(), and std::max().
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inline |
Gets the distribution p
parameter.
Definition at line 1979 of file tr1_impl/random.
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inline |
Gets the distribution t
parameter.
Definition at line 1972 of file tr1_impl/random.
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friend |
Inserts a binomial_distribution random number distribution __x
into the output stream __os
.
__os | An output stream. |
__x | A binomial_distribution random number distribution. |
__x
inserted or in an error state.
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friend |
Extracts a binomial_distribution random number distribution __x
from the input stream __is
.
__is | An input stream. |
__x | A binomial_distribution random number generator engine. |
__x
extracted or in an error state.