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casacore::Poisson Class Reference

Poisson distribution. More...

#include <Random.h>

Inheritance diagram for casacore::Poisson:
casacore::Random

Public Member Functions

 Poisson (RNG *gen, Double mean=0.0)
 Construct a random number generator for a Poisson distribution. More...
 
virtual ~Poisson ()
 The destructor is trivial. More...
 
virtual Double operator() ()
 Returns a value from the Poisson distribution. More...
 
uInt asInt ()
 
Double mean () const
 Functions that allow you to query and change the parameters of the Poisson distribution. More...
 
void mean (Double x)
 
virtual void setParameters (const Vector< Double > &parms)
 These function allow you to manipulate the parameters (mean) 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

Double itsMean
 

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

Poisson distribution.

Synopsis

The Poisson class implements a Poisson distribution. The mean parameter, is the only parameter of this distribution. The operator() functions returns a value from this distribution. The remaining members allow you to inspect and change the mean. It is assumed that the supplied mean is non-negative and an AipsError exception is thrown if this is not true. The remaining members allow you to read and set the parameters.

Example

Thrown Exceptions

To Do

Definition at line 1201 of file Random.h.

Constructor & Destructor Documentation

casacore::Poisson::Poisson ( RNG gen,
Double  mean = 0.0 
)

Construct a random number generator for a Poisson 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 argument defines the parameters for this distribution as described in the synopsis.

virtual casacore::Poisson::~Poisson ( )
virtual

The destructor is trivial.

Member Function Documentation

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

Implements casacore::Random.

Double casacore::Poisson::mean ( ) const
inline

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

Definition at line 1241 of file Random.h.

References itsMean.

void casacore::Poisson::mean ( Double  x)
virtual Double casacore::Poisson::operator() ( )
virtual

Returns a value from the Poisson 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.

virtual Vector<Double> casacore::Poisson::parameters ( ) const
virtual

Implements casacore::Random.

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

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

The Vectors must always be of length one.

Implements casacore::Random.

Member Data Documentation

Double casacore::Poisson::itsMean
private

Definition at line 1238 of file Random.h.

Referenced by mean().


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