Clause Class

This class represents a fuzzy clause, a linguistic expression of the type "Variable IS Value".

Inheritance Hierarchy

SystemObject
Accord.FuzzyClause

Namespace: Accord.Fuzzy
Assembly: Accord.Fuzzy (in Accord.Fuzzy.dll) Version: 3.8.0

Syntax

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public class Clause

Public Class Clause

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The Clause type exposes the following members.

Constructors

	Name	Description
	Clause	Initializes a new instance of the Clause class.

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Properties

	Name	Description
	Label	Gets the FuzzySet of the Clause.
	Variable	Gets the LinguisticVariable of the Clause.

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Methods

	Name	Description
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	Evaluate	Evaluates the fuzzy clause.
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Serves as the default hash function. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Returns the fuzzy clause in its linguistic representation. (Overrides ObjectToString.)

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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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Remarks

A Fuzzy Clause is used to verify if a linguistic variable can be considered as a specific value at a specific moment. Linguistic variables can only assume value of their linguistic labels. Because of the nature of the Fuzzy Logic, a Variable can be several of its labels at the same time, with different membership values.

For example, a linguistic variable "temperature" can be "hot" with a membership 0.3 and "warm" with a membership 0.7 at the same time. To obtain those memberships, Fuzzy Clauses "temperature is hot" and "temperature is war" can be built.

Typically Fuzzy Clauses are used to build Fuzzy Rules (Rule).

Sample usage:

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// create a linguistic variable to represent temperature
LinguisticVariable lvTemperature = new LinguisticVariable("Temperature", 0, 80 );

// create the linguistic labels (fuzzy sets) that compose the temperature 
TrapezoidalFunction function1 = new TrapezoidalFunction(10, 15, TrapezoidalFunction.EdgeType.Right);
FuzzySet fsCold = new FuzzySet("Cold", function1);
TrapezoidalFunction function2 = new TrapezoidalFunction(10, 15, 20, 25);
FuzzySet fsCool = new FuzzySet("Cool", function2);
TrapezoidalFunction function3 = new TrapezoidalFunction(20, 25, 30, 35);
FuzzySet fsWarm = new FuzzySet("Warm", function3);
TrapezoidalFunction function4 = new TrapezoidalFunction(30, 35, TrapezoidalFunction.EdgeType.Left);
FuzzySet fsHot  = new FuzzySet("Hot", function4);

// adding labels to the variable
lvTemperature.AddLabel(fsCold);
lvTemperature.AddLabel(fsCool);
lvTemperature.AddLabel(fsWarm);
lvTemperature.AddLabel(fsHot);

// creating the Clause
Clause fuzzyClause = new Clause(lvTemperature, fsHot);
// setting the numerical input of the variable to evaluate the Clause
lvTemperature.NumericInput = 35;
float result = fuzzyClause.Evaluate();
Console.WriteLine(result.ToString());

Reference

Accord.Fuzzy Namespace