Extensions Class Reference

Extension methods for correlation matrices More...

Static Public Member Functions
static IList< int >	GetNearestNeighbors (this ICorrelationMatrix c, int entity_id, uint k)
	Get the k nearest neighbors of a given entity More...
static IList< int >	GetPositivelyCorrelatedEntities (this ICorrelationMatrix c, int entity_id)
	Get all entities that are positively correlated to an entity, sorted by correlation More...
static void	ReadAsymmetricCorrelationMatrix (this AsymmetricCorrelationMatrix correlation, StreamReader reader)
	Reads a AsymmetricCorrelationMatrix from the lines of a StreamReader More...
static void	ReadSymmetricCorrelationMatrix (this SymmetricCorrelationMatrix correlation, StreamReader reader)
	Reads a SymmetricCorrelationMatrix from the lines of a StreamReader More...
static void	SetZero (this ICorrelationMatrix c)
	Sets all values in a matrix to zero More...
static double	SumUp (this ICorrelationMatrix correlation, int entity_id, ICollection< int > entities, float q=1.0f)
	Sum up the correlations between a given entity and the entities in a collection More...

Detailed Description

Extension methods for correlation matrices

Member Function Documentation

static IList<int> GetNearestNeighbors ( this ICorrelationMatrix  c, int  entity_id, uint  k  )

inlinestatic

Get the k nearest neighbors of a given entity

Parameters

c	a correlation matrix
entity_id	the numerical ID of the entity
k	the neighborhood size

Returns

a sorted list containing the numerical IDs of the k nearest neighbors

static IList<int> GetPositivelyCorrelatedEntities ( this ICorrelationMatrix  c, int  entity_id  )

inlinestatic

Get all entities that are positively correlated to an entity, sorted by correlation

Parameters

c	a correlation matrix
entity_id	the entity ID

Returns

a sorted list of all entities that are positively correlated to entitiy_id

static void ReadAsymmetricCorrelationMatrix ( this AsymmetricCorrelationMatrix  correlation, StreamReader  reader  )

inlinestatic

Reads a AsymmetricCorrelationMatrix from the lines of a StreamReader

In the first line, we expect to be the number of entities. All the other lines have the format

  EntityID1 EntityID2 Correlation

where EntityID1 and EntityID2 are non-negative integers and Correlation is a floating point number.

Parameters

correlation	a correlation matrix
reader	the StreamReader to read from

static void ReadSymmetricCorrelationMatrix ( this SymmetricCorrelationMatrix  correlation, StreamReader  reader  )

inlinestatic

Reads a SymmetricCorrelationMatrix from the lines of a StreamReader

In the first line, we expect to be the number of entities. All the other lines have the format

  EntityID1 EntityID2 Correlation

where EntityID1 and EntityID2 are non-negative integers and Correlation is a floating point number.

Parameters

correlation	a correlation matrix
reader	the StreamReader to read from

static void SetZero ( this ICorrelationMatrix  c )

inlinestatic

Sets all values in a matrix to zero

Parameters

c	a correlation matrix

static double SumUp ( this ICorrelationMatrix  correlation, int  entity_id, ICollection< int >  entities, float  q = 1.0f  )

inlinestatic

Sum up the correlations between a given entity and the entities in a collection

Parameters

correlation	the correlation matrix
entity_id	the numerical ID of the entity
entities	a collection containing the numerical IDs of the entities to compare to
q	score exponent

Returns

the correlation sum

---

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

• Correlation/Extensions.cs