Cosine Structure

Cosine distance. For a proper distance metric, see Angular.

Namespace: Accord.Math.Distances
Assembly: Accord.Math (in Accord.Math.dll) Version: 3.8.0

Syntax

[SerializableAttribute]
public struct Cosine : IDistance<double[]>, 
	IDistance<double[], double[]>, ISimilarity<double[]>, 
	ISimilarity<double[], double[]>

<SerializableAttribute>
Public Structure Cosine
	Implements IDistance(Of Double()), IDistance(Of Double(), Double()), 
	ISimilarity(Of Double()), ISimilarity(Of Double(), Double())

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The Cosine type exposes the following members.

Methods

	Name	Description
	Distance	Computes the distance d(x,y) between points x and y.
	Equals	Indicates whether this instance and a specified object are equal. (Inherited from ValueType.)
	GetHashCode	Returns the hash code for this instance. (Inherited from ValueType.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	Similarity	Gets a similarity measure between two points.
	ToString	Returns the fully qualified type name of this instance. (Inherited from ValueType.)

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Extension Methods

	Name	Description
	HasMethod	Checks whether an object implements a method with the given name. (Defined by ExtensionMethods.)
	IsEqual	Compares two objects for equality, performing an elementwise comparison if the elements are vectors or matrices. (Defined by Matrix.)
	To(Type)	Overloaded. Converts an object into another type, irrespective of whether the conversion can be done at compile time or not. This can be used to convert generic types to numeric types during runtime. (Defined by ExtensionMethods.)
	ToT	Overloaded. Converts an object into another type, irrespective of whether the conversion can be done at compile time or not. This can be used to convert generic types to numeric types during runtime. (Defined by ExtensionMethods.)

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Examples

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// The Cosine distance between (0, 2, 4) and (2, 5, 1) can be directly computed as:
double a = Distance.Cosine(new[] { 0.0, 2.0, 4.0 }, new[] { 2.0, 5.0, 1.0 }); // ~0.42845239335059182d

// Or could also be computed by instantiating the Cosine class beforehand as:
Cosine cos = new Cosine();
double b = cos.Distance(new[] { 0.0, 2.0, 4.0 }, new[] { 2.0, 5.0, 1.0 }); // ~0.42845239335059182d

Reference

Accord.Math.Distances Namespace

Accord.Math.DistancesAngular