Public Types¶

typedef _RealType input_type
typedef _RealType result_type

Public Member Functions¶

_RealType mean () const
normal_distribution (const result_type &__mean=result_type(0), const result_type &__sigma=result_type(1))
template<class _UniformRandomNumberGenerator > result_type operator() (_UniformRandomNumberGenerator &__urng)
void reset ()
_RealType sigma () const

Friends¶

template<typename _RealType1 , typename _CharT , typename _Traits > std::basic_ostream< _CharT, _Traits > & operator<< (std::basic_ostream< _CharT, _Traits > &__os, const normal_distribution< _RealType1 > &__x)
template<typename _RealType1 , typename _CharT , typename _Traits > std::basic_istream< _CharT, _Traits > & operator>> (std::basic_istream< _CharT, _Traits > &__is, normal_distribution< _RealType1 > &__x)

template<typename _RealType = double> class std::normal_distribution< _RealType >¶

A normal continuous distribution for random numbers.

The formula for the normal probability mass function is $ p(x) = ac{1}{gma rt{2 i}}
e^{- ac{{x - mean}^ {2}}{2 gma ^ {2}} } $.

Definition at line 2231 of file tr1_impl/random.

template<typename _RealType = double> std::normal_distribution< _RealType >::normal_distribution (const result_type & __mean = result_type(0), const result_type & __sigma = result_type(1)) [inline, explicit] Constructs a normal distribution with parameters $ mean $ and $ gma $.¶

Definition at line 2244 of file tr1_impl/random.

template<typename _RealType = double> _RealType std::normal_distribution< _RealType >::mean () const [inline] Gets the mean of the distribution.¶

Definition at line 2255 of file tr1_impl/random.

template<typename _RealType > template<class _UniformRandomNumberGenerator > normal_distribution< _RealType >::result_type std::normal_distribution< _RealType >::operator() (_UniformRandomNumberGenerator & __urng) [inline] Polar method due to Marsaglia.¶

Devroye, L. 'Non-Uniform Random Variates Generation.' Springer-Verlag, New York, 1986, Ch. V, Sect. 4.4.

Definition at line 1390 of file random.tcc.

References std::log(), and std::sqrt().

template<typename _RealType = double> void std::normal_distribution< _RealType >::reset () [inline] Resets the distribution.¶

Definition at line 2269 of file tr1_impl/random.

template<typename _RealType = double> _RealType std::normal_distribution< _RealType >::sigma () const [inline] Gets the $ gma $ of the distribution.¶

Definition at line 2262 of file tr1_impl/random.

template<typename _RealType = double> template<typename _RealType1 , typename _CharT , typename _Traits > std::basic_ostream<_CharT, _Traits>& operator<< (std::basic_ostream< _CharT, _Traits > & __os, const normal_distribution< _RealType1 > & __x) [friend] Inserts a normal_distribution random number distribution __x into the output stream __os.¶

Parameters:

Returns:

template<typename _RealType = double> template<typename _RealType1 , typename _CharT , typename _Traits > std::basic_istream<_CharT, _Traits>& operator>> (std::basic_istream< _CharT, _Traits > & __is, normal_distribution< _RealType1 > & __x) [friend] Extracts a normal_distribution random number distribution __x from the input stream __is.¶

Parameters:

Returns: