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casacore::Binomial Class Reference

Binomial distribution. More...

#include <Random.h>

Inheritance diagram for casacore::Binomial:
casacore::Random

Public Member Functions

 Binomial (RNG *gen, uInt n=1, Double p=0.5)
 Construct a random number generator for a binomial distribution. More...
 
virtual ~Binomial ()
 The destructor is trivial. More...
 
virtual Double operator() ()
 Returns a value from the Binomial distribution. More...
 
uInt asInt ()
 
uInt n () const
 Functions that allow you to query and change the parameters of the binomial distribution. More...
 
void n (uInt newN)
 
void n (Double newN)
 
Double p () const
 
void p (Double newP)
 
virtual void setParameters (const Vector< Double > &parms)
 These function allow you to manipulate the parameters (n & p) described above through the base class. More...
 
virtual Vector< Doubleparameters () const
 
virtual Bool checkParameters (const Vector< Double > &parms) const
 
- Public Member Functions inherited from casacore::Random
virtual ~Random ()
 A virtual destructor is needed to ensure that the destructor of derived classes gets used. More...
 
RNGgenerator ()
 Functions that allow you to access and change the class that generates the random bits. More...
 
void generator (RNG *p)
 

Private Attributes

uInt itsN
 
Double itsP
 

Additional Inherited Members

- Public Types inherited from casacore::Random
enum  Types {
  BINOMIAL,
  DISCRETEUNIFORM,
  ERLANG,
  GEOMETRIC,
  HYPERGEOMETRIC,
  NORMAL,
  LOGNORMAL,
  NEGATIVEEXPONENTIAL,
  POISSON,
  UNIFORM,
  WEIBULL,
  UNKNOWN,
  NUMBER_TYPES
}
 This enumerator lists all the predefined random number distributions. More...
 
- Static Public Member Functions inherited from casacore::Random
static String asString (Random::Types type)
 Convert the enumerator to a lower-case string. More...
 
static Random::Types asType (const String &str)
 Convert the string to enumerator. More...
 
static Randomconstruct (Random::Types type, RNG *gen)
 Convert the Random::Type enumerator to a specific object (derived from Random but upcast to a Random object). More...
 
static Vector< DoubledefaultParameters (Random::Types type)
 returns the default parameters for the specified distribution. More...
 
- Protected Member Functions inherited from casacore::Random
 Random (RNG *generator)
 
- Protected Attributes inherited from casacore::Random
RNGitsRNG
 

Detailed Description

Binomial distribution.

Synopsis

The binomial distribution models successfully drawing items from a pool. n is the number of items in the pool, and p, is the probability of each item being successfully drawn. The operator() functions returns an integral value indicating the number of items actually drawn from the pool. It is possible to get this same value as an integer using the asInt function.

It is assumed that n > 0 and 0 <= p <= 1 an AipsError exception thrown if it is not true. The remaining members allow you to read and set the parameters.

Example

Thrown Exceptions

To Do

Definition at line 581 of file Random.h.

Constructor & Destructor Documentation

casacore::Binomial::Binomial ( RNG gen,
uInt  n = 1,
Double  p = 0.5 
)

Construct a random number generator for a binomial distribution.

The first argument is a class that produces random bits. This pointer is NOT taken over by this class and the user is responsible for deleting it. The second and third arguments are the parameters are the Binomial distribution as described in the synopsis.

virtual casacore::Binomial::~Binomial ( )
virtual

The destructor is trivial.

Member Function Documentation

uInt casacore::Binomial::asInt ( )
virtual Bool casacore::Binomial::checkParameters ( const Vector< Double > &  parms) const
virtual

Implements casacore::Random.

uInt casacore::Binomial::n ( ) const
inline

Functions that allow you to query and change the parameters of the binomial distribution.

Definition at line 624 of file Random.h.

References itsN.

void casacore::Binomial::n ( uInt  newN)
void casacore::Binomial::n ( Double  newN)
virtual Double casacore::Binomial::operator() ( )
virtual

Returns a value from the Binomial distribution.

The returned value is a non-negative integer and using the asInt function bypasses the conversion to a floating point number.

Implements casacore::Random.

Double casacore::Binomial::p ( ) const
inline

Definition at line 628 of file Random.h.

References itsP.

void casacore::Binomial::p ( Double  newP)
virtual Vector<Double> casacore::Binomial::parameters ( ) const
virtual

Implements casacore::Random.

virtual void casacore::Binomial::setParameters ( const Vector< Double > &  parms)
virtual

These function allow you to manipulate the parameters (n & p) described above through the base class.

The Vectors must always be of length two.

Implements casacore::Random.

Member Data Documentation

uInt casacore::Binomial::itsN
private

Definition at line 620 of file Random.h.

Referenced by n().

Double casacore::Binomial::itsP
private

Definition at line 621 of file Random.h.

Referenced by p().


The documentation for this class was generated from the following file: