Detailed Description

class CanberraMetric

The Canberra distance sums up the dissimilarity (ratios) between feature dimensions of two data points.

$\displaystyle d(\bf{x},\bf{x'}) = \sum_{i=1}^{n}\frac{|\bf{x_{i}-\bf{x'_{i}}}|} {|\bf{x_{i}}|+|\bf{x'_{i}}|} \quad \bf{x},\bf{x'} \in R^{n}$

A summation element has range [0,1]. Note that $d(x,0)=d(0,x')=n$ and $d(0,0)=0$ .

Definition at line 35 of file CanberraMetric.h.

Inheritance diagram for CCanberraMetric:

[legend]

List of all members.

Public Member Functions
	CCanberraMetric ()
	CCanberraMetric (CSimpleFeatures< float64_t > l, CSimpleFeatures< float64_t > r)
virtual	~CCanberraMetric ()
virtual bool	init (CFeatures l, CFeatures r)
virtual void	cleanup ()
virtual EDistanceType	get_distance_type ()
virtual const char *	get_name () const
Protected Member Functions
virtual float64_t	compute (int32_t idx_a, int32_t idx_b)

Constructor & Destructor Documentation

CCanberraMetric ( )

default constructor

Definition at line 20 of file CanberraMetric.cpp.

CCanberraMetric	(	CSimpleFeatures< float64_t > *	l,
		CSimpleFeatures< float64_t > *	r
	)

constructor

Parameters:

	l	features of left-hand side
	r	features of right-hand side

Definition at line 25 of file CanberraMetric.cpp.

~CCanberraMetric ( ) [virtual]

Definition at line 31 of file CanberraMetric.cpp.

Member Function Documentation

void cleanup ( ) [virtual]

cleanup distance

Implements CSimpleDistance< float64_t >.

Definition at line 43 of file CanberraMetric.cpp.

float64_t compute	(	int32_t	idx_a,
		int32_t	idx_b
	)			`[protected, virtual]`

compute distance for features a and b idx_{a,b} denote the index of the feature vectors in the corresponding feature object

Implements CDistance.

Definition at line 47 of file CanberraMetric.cpp.

virtual EDistanceType get_distance_type ( ) [virtual]

get distance type we are

Returns:: distance type CANBERRA

Implements CSimpleDistance< float64_t >.

Definition at line 64 of file CanberraMetric.h.

virtual const char* get_name ( ) const [virtual]

get name of the distance

Returns:: name Canberra-Metric

Reimplemented from CSimpleDistance< float64_t >.

Definition at line 70 of file CanberraMetric.h.

bool init	(	CFeatures *	l,
		CFeatures *	r
	)			`[virtual]`

init distance

Parameters:

	l	features of left-hand side
	r	features of right-hand side

Returns:: if init was successful

Reimplemented from CSimpleDistance< float64_t >.

Definition at line 36 of file CanberraMetric.cpp.

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

CCanberraMetric Class Reference

Detailed Description

Public Member Functions

Protected Member Functions

Constructor & Destructor Documentation

Member Function Documentation