FLT::Rule Class Reference

This class contains methods and attributes common to fuzzy Rules. More...

#include <rule.hpp>

Collaboration diagram for FLT::Rule:

Public Member Functions
size_t	n_inputs (void) const
	Extract the number of inputs of the Rule.
int	test (void) const
	This function checks the parameters of all Membership functions in the Rule, and corrects them if possible. More...
int	changeTSK (double value, size_t input)
	Changes a parameter in the TSK consequent. More...
void	changeTSK (const double *const TSK)
	Changes the TSK consequent.
double	readTSK (size_t input) const
	Reads a TSK parameter. More...
TNT::Array1D< double >	readTSK (void) const
	Reads the TSK consequent.
Membership *	readFunction (size_t input)
	Extracts a pointer to a Membership function. More...
int	changeFunction (const Membership &P, size_t input)
	Changes a Membership function of the Rule. More...
int	changeFunction (TYPE_MF type, size_t input)
	Changes the type af a Membership function. More...
void	initialize (size_t in)
	Initializes the Rule for in inputs. More...
size_t	NumberOfAntecedents (void)
	Gets the number of parameters stored in the antecedents of the Rule. More...
int	setAntecedents (const double *const parameters)
	Sets the parameters of the antecedents of the Rule. More...
TNT::Array1D< double >	getAntecedents (void)
	Gets the parameters of the antecedents of the Rule.
void	setConsequents (const double *const parameters)
	Sets the consequents of the Rule.
TNT::Array1D< double >	getConsequents (void)
	Gets the consequents of the Rule.
double	activation (const double *const point, double *dW=NULL) const
	Calculates the matching degree of the rule in point and, optionally, its derivative. More...
Rule &	operator= (const Rule &R)
	Rule (const Rule &R)
	Rule (size_t in)

Private Member Functions
void	clean (void)
	Cleans the dynamic memory.

Private Attributes
size_t	in
	Number of inputs of the Rule.
double *	TSK
	TSK consequent of the Rule.
Membership **	membership
	Membership functions of the Rule.

Detailed Description

This class contains methods and attributes common to fuzzy Rules.

This class stores a completely general Takagi-Sugeno Rule.

See also

You can use the Anymf Membership function to remove a variable from the antecedent of a Rule.

For Template Numerical Toolkit (TNT) documentation see http://math.nist.gov/tnt

Examples:

matlab_utilities/fuz2mat.cpp, matlab_utilities/fuzcomb.cpp, and matlab_utilities/mat2fuz.cpp.

Member Function Documentation

double Rule::activation	(	const double *const	point,
		double *	dW = NULL
	)		const

Calculates the matching degree of the rule in point and, optionally, its derivative.

Optionally, this function also calculates the derivative of the degree of activation of the rule with respect to the input at point.
dW represents , and its length is equal to the number of entries in the rule.

The length of point must match the number of inputs in the rule.

int Rule::changeFunction	(	const Membership &	P,
		size_t	input
	)

Changes a Membership function of the Rule.

Returns

Returns 0 if no errors occurred.
An error means the input is greater than the number of Rule inputs.

Examples:

matlab_utilities/fuzcomb.cpp.

int Rule::changeFunction	(	TYPE_MF	type,
		size_t	input
	)

Changes the type af a Membership function.

Returns

Returns 0 if no errors occurred.
An error means the type of Membership function is not recognized (1) or input is greater than the number of Rule inputs (2).

Note

The parameters of the new Membership function are not assigned, you must do so by Membership::edit method.

int Rule::changeTSK	(	double	value,
		size_t	input
	)

Changes a parameter in the TSK consequent.

Returns

Returns 0 if no errors occurred.
An error means the input is greater than the number of parameter of the consequent.

Note

TSK(0) is the affine term, TSK(1) is the term associated to the 1st input variable, ...

Examples:

matlab_utilities/fuzcomb.cpp.

void Rule::initialize

(

size_t

in

)

Initializes the Rule for in inputs.

Empty membership functions are used. You can change them with changeFunction method or using the Membership class methods.

size_t Rule::NumberOfAntecedents

(

void

)

Gets the number of parameters stored in the antecedents of the Rule.

Note

The function NumberOfConsequents(void) is not necessary because this value is in+1.

Examples:

matlab_utilities/mat2fuz.cpp.

Membership * Rule::readFunction

(

size_t

input

)

Extracts a pointer to a Membership function.

Returns

Returns NULL if the input is greater than the number of Rule inputs.

Examples:

matlab_utilities/fuzcomb.cpp.

double Rule::readTSK

(

size_t

input

)

const

Reads a TSK parameter.

Returns

Returns the selected parameter. If input is greater than the number of Rule inputs, an error is sent to the standard error stream and return 0.

Examples:

matlab_utilities/fuzcomb.cpp.

int Rule::setAntecedents

(

const double *const

parameters

)

Sets the parameters of the antecedents of the Rule.

Returns

Returns the result of running the Rule::test() method.

Examples:

matlab_utilities/mat2fuz.cpp.

int Rule::test

(

void

)

const

This function checks the parameters of all Membership functions in the Rule, and corrects them if possible.

Returns

Returns 0 if no errors, 1 if an error occurs, and -1 if the parameters were corrected.

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

• rule.hpp
• rule.cpp