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/*
fuzzylite (R), a fuzzy logic control library in C++.
Copyright (C) 2010-2017 FuzzyLite Limited. All rights reserved.
Author: Juan Rada-Vilela, Ph.D. <jcrada@fuzzylite.com>
This file is part of fuzzylite.
fuzzylite is free software: you can redistribute it and/or modify it under
the terms of the FuzzyLite License included with the software.
You should have received a copy of the FuzzyLite License along with
fuzzylite. If not, see <http://www.fuzzylite.com/license/>.
fuzzylite is a registered trademark of FuzzyLite Limited.
*/
#ifndef FL_BELL_H
#define FL_BELL_H
#include "fl/term/Term.h"
namespace fl {
/**
The Bell class is an extended Term that represents the generalized bell
curve membership function.
@image html bell.svg
@author Juan Rada-Vilela, Ph.D.
@see Term
@see Variable
@since 4.0
*/
class FL_API Bell : public Term {
private:
scalar _center;
scalar _width;
scalar _slope;
public:
explicit Bell(const std::string& name = "",
scalar center = fl::nan,
scalar width = fl::nan,
scalar slope = fl::nan,
scalar height = 1.0);
virtual ~Bell() FL_IOVERRIDE;
FL_DEFAULT_COPY_AND_MOVE(Bell)
virtual std::string className() const FL_IOVERRIDE;
/**
Returns the parameters of the term
@return `"center width slope [height]"`
*/
virtual std::string parameters() const FL_IOVERRIDE;
/**
Configures the term with the parameters
@param parameters as `"center width slope [height]"`
*/
virtual void configure(const std::string& parameters) FL_IOVERRIDE;
virtual Complexity complexity() const FL_IOVERRIDE;
/**
Computes the membership function evaluated at @f$x@f$
@param x
@return @f$h / (1 + \left(|x-c|/w\right)^{2s}@f$
where @f$h@f$ is the height of the Term,
@f$c@f$ is the center of the Bell,
@f$w@f$ is the width of the Bell,
@f$s@f$ is the slope of the Bell
*/
virtual scalar membership(scalar x) const FL_IOVERRIDE;
/**
Sets the center of the bell curve
@param center is the center of the bell curve
*/
virtual void setCenter(scalar center);
/**
Gets the center of the bell curve
@return the center of the bell curve
*/
virtual scalar getCenter() const;
/**
Sets the width of the bell curve
@param width is the width of the bell curve
*/
virtual void setWidth(scalar width);
/**
Gets the width of the bell curve
@return the width of the bell curve
*/
virtual scalar getWidth() const;
/**
Sets the slope of the bell curve
@param slope is the slope of the bell curve
*/
virtual void setSlope(scalar slope);
/**
Gets the slope of the bell curve
@return the slope of the bell curve
*/
virtual scalar getSlope() const;
virtual Bell* clone() const FL_IOVERRIDE;
static Term* constructor();
};
}
#endif /* FL_BELL_H */
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