Fennel: PoissonColumnGenerator< T > Class Template Reference (original) (raw)

Column generator which generates values with a Poisson distribution. More...

#include <[ExecStreamGenerator.h](ExecStreamGenerator%5F8h-source.html)>

Inheritance diagram for PoissonColumnGenerator< T >:

Public Member Functions
	PoissonColumnGenerator (T startValue, double meanDistance, int batchSize, uint seed)
virtual	~PoissonColumnGenerator ()
T	next ()
Private Member Functions
void	generateBatch ()
	Populates the next batch of values.
Private Attributes
T	currentValue
vector< T >	nextValues
	batch of pre-generated values
int	ordinalInBatch
	position in the batch of the last value we returned
T	batchUpper
	upper bound of current batch, will be the lower bound of the next
std::subtractive_rng	rng
double	meanDistance

Detailed Description

template

class PoissonColumnGenerator< T >

Column generator which generates values with a Poisson distribution.

The Poisson distribution is a statistical distribution which characterizes the intervals between successive events. For example, consider a large sample of a radioactive isotope with a long half-life, and a Geiger counter measuring decay events. The number of events N between time t=0 and t=1 will be Poisson distributed.

This generator generates an ascending sequence of values with a given mean distance between values. For example, the sequence [3, 17, 24, 39, 45] might be the first five values generated if startValue = 0 and meanDistance = 10.

The generator generates a better statistical distribution if you give it a larger value of batchSize.

Definition at line 189 of file ExecStreamGenerator.h.

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation

template

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

/home/pub/open/dev/fennel/test/ExecStreamGenerator.h

Generated on Mon Jun 22 04:00:40 2009 for Fennel by 1.5.1