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boost::random::beta_distribution
// In header: <boost/random/beta_distribution.hpp> template<typename RealType = double> class beta_distribution { public: // types typedef RealType ; typedef RealType ; // member classes/structs/unions class param_type { public: // types typedef beta_distribution ; // construct/copy/destruct (RealType = , RealType = ); // public member functions RealType () ; RealType () ; // friend functions template<typename CharT, typename Traits> CharT, Traits > & (CharT, Traits > &, const param_type &); template<typename CharT, typename Traits> CharT, Traits > & (CharT, Traits > &, const param_type &); bool (const param_type &, const param_type &); bool (const param_type &, const param_type &); }; // construct/copy/destruct (RealType = , RealType = ); (const param_type &); // public member functions template<typename URNG> RealType (URNG &) ; template<typename URNG> RealType (URNG &, const param_type &) ; RealType () ; RealType () ; RealType () ; RealType () ; param_type () ; void (const param_type &); void (); // friend functions template<typename CharT, typename Traits> CharT, Traits > & (CharT, Traits > &, const beta_distribution &); template<typename CharT, typename Traits> CharT, Traits > & (CharT, Traits > &, const beta_distribution &); bool (const beta_distribution &, const beta_distribution &); bool (const beta_distribution &, const beta_distribution &); };
The beta distribution is a real-valued distribution which produces values in the range [0, 1]. It has two parameters, alpha and beta.
It has .
beta_distribution
public
construct/copy/destruct(RealType alpha = , RealType beta = );
Constructs an
from its "alpha" and "beta" parameters.beta_distribution
Requires: alpha > 0, beta > 0
(const param_type & param);
Constructs an
from its parameters. beta_distribution
beta_distribution
public member functionstemplate<typename URNG> RealType (URNG & urng) ;
Returns a random variate distributed according to the beta distribution.
template<typename URNG> RealType (URNG & urng, const param_type & param) ;
Returns a random variate distributed accordint to the beta distribution with parameters specified by param
.
RealType () ;
Returns the "alpha" parameter of the distribution.
RealType () ;
Returns the "beta" parameter of the distribution.
RealType () ;
Returns the smallest value that the distribution can produce.
RealType () ;
Returns the largest value that the distribution can produce.
param_type () ;
Returns the parameters of the distribution.
void (const param_type & param);
Sets the parameters of the distribution.
void ();
Effects: Subsequent uses of the distribution do not depend on values produced by any engine prior to invoking reset.
beta_distribution
friend functionstemplate<typename CharT, typename Traits> CharT, Traits > & (CharT, Traits > & os, const beta_distribution & wd);
Writes an
to a beta_distribution
std::ostream
.
template<typename CharT, typename Traits> CharT, Traits > & (CharT, Traits > & is, const beta_distribution & wd);
Reads an
from a beta_distribution
std::istream
.
bool (const beta_distribution & lhs, const beta_distribution & rhs);
Returns true if the two instances of
will return identical sequences of values given equal generators. beta_distribution
bool (const beta_distribution & lhs, const beta_distribution & rhs);
Returns true if the two instances of
will return different sequences of values given equal generators. beta_distribution