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casacore::Normal Class Reference

Normal or Gaussian distribution. More...

#include <Random.h>

Inheritance diagram for casacore::Normal:
casacore::Random casacore::LogNormal

Public Member Functions

 Normal (RNG *gen, Double mean=0.0, Double variance=1.0)
 Construct a random number generator for a normal distribution. More...
 
virtual ~Normal ()
 The destructor is trivial. More...
 
virtual Double operator() ()
 Returns a value from the normal distribution. More...
 
virtual Double mean () const
 Functions that allow you to query and change the parameters of the normal distribution. More...
 
virtual void mean (Double x)
 
virtual Double variance () const
 
virtual void variance (Double x)
 
virtual void setParameters (const Vector< Double > &parms)
 These function allow you to manipulate the parameters (mean & variance) 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
 
Double itsVariance
 
Double itsStdDev
 
Bool itsCached
 
Double itsCachedValue
 

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

Normal or Gaussian distribution.

Synopsis

The Normal class implements the normal or Gaussian distribution. The mean and variance are the parameters of the distribution. The operator() functions returns a value from this distribution

It is assumed that the supplied variance is positive and an AipsError exception is thrown if this is not true. The remaining members allow you to read and set the parameters. The LogNormal class is derived from this one.

Example

Thrown Exceptions

To Do

Definition at line 997 of file Random.h.

Constructor & Destructor Documentation

casacore::Normal::Normal ( RNG gen,
Double  mean = 0.0,
Double  variance = 1.0 
)

Construct a random number generator for a normal 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 define the parameters for this distribution as described in the synopsis.

virtual casacore::Normal::~Normal ( )
virtual

The destructor is trivial.

Member Function Documentation

virtual Bool casacore::Normal::checkParameters ( const Vector< Double > &  parms) const
virtual

Implements casacore::Random.

Reimplemented in casacore::LogNormal.

Double casacore::Normal::mean ( ) const
inlinevirtual

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

Reimplemented in casacore::LogNormal.

Definition at line 1038 of file Random.h.

References itsMean.

virtual void casacore::Normal::mean ( Double  x)
virtual

Reimplemented in casacore::LogNormal.

virtual Double casacore::Normal::operator() ( )
virtual

Returns a value from the normal distribution.

Implements casacore::Random.

Reimplemented in casacore::LogNormal.

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

Implements casacore::Random.

Reimplemented in casacore::LogNormal.

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

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

The Vectors must always be of length two.

Implements casacore::Random.

Reimplemented in casacore::LogNormal.

Double casacore::Normal::variance ( ) const
inlinevirtual

Reimplemented in casacore::LogNormal.

Definition at line 1042 of file Random.h.

References itsVariance.

virtual void casacore::Normal::variance ( Double  x)
virtual

Reimplemented in casacore::LogNormal.

Member Data Documentation

Bool casacore::Normal::itsCached
private

Definition at line 1034 of file Random.h.

Double casacore::Normal::itsCachedValue
private

Definition at line 1035 of file Random.h.

Double casacore::Normal::itsMean
private

Definition at line 1031 of file Random.h.

Referenced by mean().

Double casacore::Normal::itsStdDev
private

Definition at line 1033 of file Random.h.

Double casacore::Normal::itsVariance
private

Definition at line 1032 of file Random.h.

Referenced by variance().


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