TIFuzzyVariable Class

TPersistent
IFuzzyLogic.TIFuzzyVariablePersistent
IFuzzyLogic.TIFuzzyVariable

Delphi

type
TIFuzzyVariable = class(TIFuzzyVariablePersistent, IFuzzyVariable, ICloneable, IInterface)
end;

	Name	Description
	Create(String)	Initializes a new instance of the TIFuzzyVariable class.
	Destroy	Represents the destructor of the TIFuzzyVariable class.

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	Name	Description
	AsString	Returns a string representation of the fuzzy variable. The string representation is parsable by the parser defined in the Parser property
	Comment	Contains a comment about the fuzzy variable. Use this property for any descriptive text you want to define about the fuzzy variable
	DefuzzificationMethod	Defines the defuzzification method that fuzzy sets should use for determining a value that best represents the fuzzy set. There are two methods available: center of gravity and mean of maxima
	FuzzySetClass	Represents property FuzzySetClass.
	IgnoreRelease	Represents property IgnoreRelease.
	Items	Tracks all the fuzzy sets in the fuzzy variable.
	Maximum	Defines the maximum X value for the fuzzy variable, its universe of discourse.
	Minimum	Defines the minimum X value for the fuzzy variable, its universe of discourse.
	Name	Defines the name of the fuzzy variable.
	NumFunctionValues	Defines the default number of XY value pairs used to create fuzzy sets
	OnChange	Occurs when the fuzzy variable is changed, either its properties such as Minimum and Maximum or when fuzzy sets are added and deleted.
	Parser	Refers to the IFuzzyParser interface implementation which can print and parse the fuzzy variable and its fuzzy sets
	Tag	Represents property Tag.
	Threshold	Defines the "noise" level of fuzzy sets in the variable. When two fuzzy sets are compared to see if they are equal, all the XY value pairs of the two fuzzy sets are compared. If the minimum Y value of the two fuzzy sets at some X point exceed the threshold, then they equal
	Units	Defines the units of the universe of discourse (the X range units). For example, if the fuzzy variable was temperature, the Units may be ' Celcius' or 'Kelvin'.

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	Name	Description
	Add(IFuzzySet)	Overloaded. Adds the existing fuzzy set, or term, into the fuzzy variable. If a fuzzy set already exists in the fuzzy variable with the same name, the old fuzzy set is deleted.
	Add(String)	Overloaded. Creates a new fuzzy set, or term, in the fuzzy variable with the specified name. If a fuzzy set already exists in the fuzzy variable with the same name, the old fuzzy set is deleted
	AssertRule(IFuzzySet,IFuzzySet,IFuzzySet,IFuzzySet)	Overloaded. Performs implication using correlation rules.
	AssertRule(IFuzzySet[],IFuzzySet[],IFuzzySet,IFuzzySet)	Overloaded. Performs implication using correlation rules.
	AssertRule(TFzyFloat,IFuzzySet,IFuzzySet)	Overloaded. Performs implication using correlation rules.
	Assign(IInterface)	Overloaded. Copies the AValue to the current fuzzy variable. If the AValue parameter implements the IFuzzyVariable interface, this method copies the fuzzy sets from the fuzzy variable.
	Assign(TPersistent)	Overloaded. Copies the Source to the current fuzzy variable
	AssignFuzzySets(IFuzzyVariable)	Copies the fuzzy sets from the Source fuzzy variable to the current variable. All the original fuzzy sets are deleted
	BeginUpdate	Suspends change events from occuring until the EndUpdate method is called. Use BeginUpdate to speed processing while values are added to or deleted from the fuzzy variable
	Changed	Represents method Changed.
	Clear	Deletes all the fuzzy sets from the variable
	ClearFuzzySets	Represents method ClearFuzzySets.
	Clone	Creates a copy of the fuzzy variable including the fuzzy sets
	ContainsFuzzySet(String)	Checks to see if a fuzzy set of the specified name exists in the fuzzy variable. If the fuzzy set does exist, it is returned, else nil.
	CreateItems	Represents method CreateItems.
	EndUpdate	Reenables change events after BeginUpdate has been called. Calls to BeginUpdate are cumulative, so calling EndUpdate will only fire a change event if every other call to BeginUpdate has already been matched by a call to EndUpdate.
	Equals(IInterface)	Returns TRUE if the fuzzy variable equals the AValue fuzzy variable, including the fuzzy sets. If the AValue parameter does not implement the IFuzzyVariable interface, this method returns FALSE
	FuzzySetChanged(IFuzzySet)	Overloaded. Call this method when the fuzzy set has been modified
	GetComment	Represents method GetComment.
	GetCorrelationStrength(IFuzzySet[],IFuzzySet[])	Returns the minimum of the correlation strengths of the Premises matched with the Matchings fuzzy sets
	GetCount	Represents method GetCount.
	GetDefuzzificationMethod	Represents method GetDefuzzificationMethod.
	GetFuzzySet(Integer)	Represents method GetFuzzySet(Integer).
	GetFuzzySetByName(String)	Represents method GetFuzzySetByName(String).
	GetMaximum	Represents method GetMaximum.
	GetMinimum	Represents method GetMinimum.
	GetName	Represents method GetName.
	GetNumFunctionValues	Represents method GetNumFunctionValues.
	GetOnChange	Represents method GetOnChange.
	GetOnFuzzySetAdded	Represents method GetOnFuzzySetAdded.
	GetOnFuzzySetChange	Represents method GetOnFuzzySetChange.
	GetOnFuzzySetDeleted	Represents method GetOnFuzzySetDeleted.
	GetOnVariableChange	Represents method GetOnVariableChange.
	GetParser	Represents method GetParser.
	GetTag	Represents method GetTag.
	GetThreshold	Represents method GetThreshold.
	GetUnits	Represents method GetUnits.
	NewFuzzySet(IFuzzySet)	Represents method NewFuzzySet(IFuzzySet).
	QueryInterface(TGUID,Void)	Represents method QueryInterface(TGUID,Void).
	Remove(IFuzzySet)	Deletes the fuzzy set from the fuzzy variable
	RemoveFuzzySet(IFuzzySet)	Represents method RemoveFuzzySet(IFuzzySet).
	SetComment(String)	Represents method SetComment(String).
	SetDefuzzificationMethod(TDefuzzificationMethod)	Represents method SetDefuzzificationMethod(TDefuzzificationMethod).
	SetMaximum(TFzyFloat)	Represents method SetMaximum(TFzyFloat).
	SetMinimum(TFzyFloat)	Represents method SetMinimum(TFzyFloat).
	SetName(String)	Represents method SetName(String).
	SetNumFunctionValues(Integer)	Represents method SetNumFunctionValues(Integer).
	SetOnChange(TNotifyEvent)	Represents method SetOnChange(TNotifyEvent).
	SetOnFuzzySetAdded(TIFuzzySetEvent)	Represents method SetOnFuzzySetAdded(TIFuzzySetEvent).
	SetOnFuzzySetChange(TIFuzzySetEvent)	Represents method SetOnFuzzySetChange(TIFuzzySetEvent).
	SetOnFuzzySetDeleted(TIFuzzySetEvent)	Represents method SetOnFuzzySetDeleted(TIFuzzySetEvent).
	SetOnVariableChange(TIFuzzyVariableEvent)	Represents method SetOnVariableChange(TIFuzzyVariableEvent).
	SetParser(IFuzzyParser)	Represents method SetParser(IFuzzyParser).
	SetTag(TRSTag)	Represents method SetTag(TRSTag).
	SetThreshold(TFzyFloat)	Represents method SetThreshold(TFzyFloat).
	SetUnits(String)	Represents method SetUnits(String).
	ToString	Returns a string representation of the fuzzy variable. The string representation is parsable by the parser defined in the Parser property
	_AddRef	Represents method _AddRef.
	_Release	Represents method _Release.

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	Name	Description
	OnFuzzySetAdded	Occurs when a fuzzy set is added to the fuzzy variable
	OnFuzzySetChange	Occurs when a fuzzy set in the fuzzy variable changes.
	OnFuzzySetDeleted	Occurs when a fuzzy set is removed from the fuzzy variable
	OnVariableChange	Occurs when the fuzzy variable is changed, either its properties such as Minimum and Maximum or when fuzzy sets are added and deleted.

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Fuzzy Variables are much like set variables in Pascal. However, unlike Pascal variables, the enumerated items, or terms, in the set are fuzzy and not crisp. Pascal allows enumerated values to either be in or not in the set. Fuzzy variables allow values to be partially in the set. For example, we may define a fuzzy variable which is based on Temperature. Any variable of this type may take fuzzy set ( TIFuzzySet) values of cold, warm, and hot (or some combination). Cold, warm, and hot are the fuzzy sets which define the terms of the type. Each fuzzy set defines a membership function over the domain of temperature. If, for our example, temperature has a range between 0 and 100 Celsius, Cold could be a fuzzy set that defined any value under 10 Celcius as completely cold (one or True), any value over 50 as not at all cold (zero), and any value in between having a membership between zero and one.

The most important function of the Fuzzy Variable is that it acts as the domain for its fuzzy sets. It defines the universe of discourse ( the X range) over which values and sets in the variable may take. Before working with fuzzy sets, you must define a fuzzy variable. Fuzzy sets must have unique names.

Reference

•IFuzzyLogic

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