#include <membership.hpp>

Inheritance diagram for FLT::Sigmf:

Collaboration diagram for FLT::Sigmf:

Public Member Functions
double	eval (double x) const
	Evaluates the Membership function. More...

double	evalder (double x) const
	Evaluates the derivative of the Membership function with respect to x, $d\mu(x) / dx$ . More...

double	paramder (size_t parameter, double x) const
	Evaluates the derivative of the Membership function with respect to a parameter, $d\mu(x) / dparam$ . More...

	Sigmf (double a=14, double c=0.25)

virtual int	test (void) const
	This function checks parameters in the Membership function, and corrects them if possible. More...

size_t	num_params (void) const
	Reads the number of parameters that define the Membership function. More...

TYPE_MF	type (void) const
	Returns the type of Membership function. More...

int	type (TYPE_MF type_mf)
	Changes the Membership function type. More...

int	edit (size_t index, double value)
	Changes a parameter. More...

void	edit (const double *const parameters)
	Changes the vector of parameters. More...

double	read (size_t index) const
	Reads a parameter of the Membership function. More...

TNT::Array1D< double >	read (void) const
	Returns the vector of parameters.

Protected Attributes
double *	param
	Vector of parameters that define the Membership function.

size_t	n
	Number of parameters of the Membership function.

TYPE_MF	type_mf
	Type of Membership function.

Detailed Description

Sigmoidal Membership function.

Sigmf is a sigmoidal Membership function with 2 parameters.

$\mu [\alpha,c](x) = \frac{1}{1+e^{\alpha(c-x)}}$

Member Function Documentation

int Membership::edit	(	size_t	index,
		double	value
	)

inherited

Changes a parameter.

Returns: Returns 0 if no errors occurred.
An error means the index value is greater than the number of function parameters.

Note: The parameter value is not checked. If you want to check it, you must use Membership::test method.

void Membership::edit ( const double *const parameters )

inherited

Changes the vector of parameters.

Note: The values of the parameters are not checked. If you want to check it, you must use Membership::test method.

double Sigmf::eval ( double x ) const

virtual

Evaluates the Membership function.

Remarks: You must first ensure that the function is not Anymf.

Implements FLT::Membership.

double Sigmf::evalder ( double x ) const

virtual

Evaluates the derivative of the Membership function with respect to x, $d\mu(x) / dx$ .

Remarks: You must first ensure that the function is not Anymf.

Implements FLT::Membership.

size_t Membership::num_params ( void ) const

inherited

Reads the number of parameters that define the Membership function.

We recommend using this function instead of the constant FLT::MF_PARAM_NUMBER, since it is possible to create Membership functions with a variable number of parameters.

Examples:: matlab_utilities/fuzderantec.cpp.

double Sigmf::paramder	(	size_t	parameter,
		double	x
	)		const

virtual

Evaluates the derivative of the Membership function with respect to a parameter, $d\mu(x) / dparam$ .

Remarks: You must first ensure that the function is not Anymf.

Implements FLT::Membership.

double Membership::read ( size_t index ) const

inherited

Reads a parameter of the Membership function.

Returns: If index is greater than the number of function parameters, an error is sent to the standard error stream and return 0.

int Membership::test ( void ) const

virtualinherited

This function checks parameters in the Membership function, and corrects them if possible.

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

Reimplemented in FLT::Trimf, FLT::Trapmf, FLT::GBellmf, FLT::Gauss2mf, and FLT::Gaussmf.

TYPE_MF Membership::type ( void ) const

inherited

Returns the type of Membership function.

The type of Membership function is represented with the enumeration FLT::TYPE_MF.

Examples:: matlab_utilities/fuzcomb.cpp, and matlab_utilities/fuzderantec.cpp.

int Membership::type ( TYPE_MF type_mf )

inherited

Changes the Membership function type.

Returns: Returns 0 if no errors occurred.
An error means the type of Membership function is not recognized.

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

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

membership.hpp
membership.cpp

Public Member Functions

Protected Attributes

Detailed Description

Member Function Documentation