CNFVar -- Fuzzy variable

SYNOPSIS

#include <CNCL/FVar.h>

TYPE

CN_FVAR

BASE CLASSES

CNNamed

DERIVED CLASSES

None

RELATED CLASSES

None

DESCRIPTION

This class creates a fuzzy variable and its corrosponding linguistic variable. For example, the linguistic variable "temperature" migth be programmed this way:
CNFVar temp("Temperature", 0, 100);
enum { COLD, MEDIUM, WARM, HOT };
temp.add_value_set(COLD, new CNFSetTrapez("cold", 0, 10, 0, 10));
temp.add_value_set(MEDIUM, new CNFSetTrapez("medium", 20, 20, 10, 10));
temp.add_value_set(WARM, new CNFSetTrapez("warm", 30, 40, 10, 5));
temp.add_value_set(HOT, new CNFSetTrapez("hot", 40,100, 10, 0));
Here trapezium functions have been assumed as membership function, but all other kinds of (implemented) functions are possible.

Constructors:

CNFVar(CNParam *param);

CNFVar(double min = 0, double max = 1);

CNFVar(const CNString &xname, double min = 0, double max = 1);

Initializes the CNFVar.

In addition to the member functions required by CNCL, CNFVar provides:

double value( double x );

double set_value( double x );

Sets the (non fuzzy) variable value to x and returns the old value.

double value() const

double get_value()const;

Returns the (non-fuzzy) value.

CNFSet* fuzzy_value( CNFSet* x );

CNFSet* set_fuzzy_value( CNFSet* x );

Sets the fuzzy variable value (fuzzy set) to x and returns the old value.

CNFSet* fuzzy_value() const;

CNFSet* get_fuzzy_value() const;

Returns the fuzzy value (fuzzy set).

double xmin() const;

double get_xmin() const;

double xmax() const;

double get_xmax() const;

Returns the minimum and maximum values of the variable's range.

void add_value_set(CNFSet &fset);

void add_value_set(CNFSet *fset);

void add_value_set(int i, CNFSet &fset);

void add_value_set(int i, CNFSet *fset);

Adds the fuzzy set fset to the array of affiliated sets, either at position i (overwritting) or at the end (extending).

CNFSet *get_value_set(int i);

Returns the fuzzy set at array position i.

double get_membership( int i);

Gets the membership value of the fuzzy set at array position i.

void print_membership();

Computes the membership value for all fuzzy sets using the current value and prints the result.

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