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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_GAUSSIAN_H
#define FL_GAUSSIAN_H
#include "fl/term/Term.h"
namespace fl {
/**
The Gaussian class is an extended Term that represents the %Gaussian
curve membership function.
@image html gaussian.svg
@author Juan Rada-Vilela, Ph.D.
@see Term
@see Variable
@since 4.0
*/
class FL_API Gaussian : public Term {
private:
scalar _mean;
scalar _standardDeviation;
public:
explicit Gaussian(const std::string& name = "",
scalar mean = fl::nan,
scalar standardDeviation = fl::nan,
scalar height = 1.0);
virtual ~Gaussian() FL_IOVERRIDE;
FL_DEFAULT_COPY_AND_MOVE(Gaussian)
virtual std::string className() const FL_IOVERRIDE;
/**
Returns the parameters of the term
@return `"mean standardDeviation [height]"`
*/
virtual std::string parameters() const FL_IOVERRIDE;
/**
Configures the term with the parameters
@param parameters as `"mean standardDeviation [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 \times \exp(-(x-\mu)^2/(2\sigma^2))@f$
where @f$h@f$ is the height of the Term,
@f$\mu@f$ is the mean of the Gaussian,
@f$\sigma@f$ is the standard deviation of the Gaussian
*/
virtual scalar membership(scalar x) const FL_IOVERRIDE;
/**
Sets the mean of the Gaussian curve
@param mean is the mean of the Gaussian curve
*/
virtual void setMean(scalar mean);
/**
Gets the mean of the Gaussian curve
@return the mean of the Gaussian curve
*/
virtual scalar getMean() const;
/**
Sets the standard deviation of the Gaussian curve
@param standardDeviation is the standard deviation of the Gaussian curve
*/
virtual void setStandardDeviation(scalar standardDeviation);
/**
Gets the standard deviation of the Gaussian curve
@return the standard deviation of the Gaussian curve
*/
virtual scalar getStandardDeviation() const;
virtual Gaussian* clone() const FL_IOVERRIDE;
static Term* constructor();
};
}
#endif /* FL_GAUSSIAN_H */
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