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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.
*/
#include "fl/term/Bell.h"
namespace fl {
Bell::Bell(const std::string& name, scalar center, scalar width, scalar slope, scalar height)
: Term(name, height), _center(center), _width(width), _slope(slope) { }
Bell::~Bell() { }
std::string Bell::className() const {
return "Bell";
}
Complexity Bell::complexity() const {
return Complexity().comparison(1).arithmetic(6).function(2);
}
scalar Bell::membership(scalar x) const {
if (Op::isNaN(x)) return fl::nan;
return Term::_height * (1.0 / (1.0 + std::pow(std::abs((x - _center) / _width), 2.0 * _slope)));
}
std::string Bell::parameters() const {
return Op::join(3, " ", _center, _width, _slope) +
(not Op::isEq(getHeight(), 1.0) ? " " + Op::str(getHeight()) : "");
}
void Bell::configure(const std::string& parameters) {
if (parameters.empty()) return;
std::vector<std::string> values = Op::split(parameters, " ");
std::size_t required = 3;
if (values.size() < required) {
std::ostringstream ex;
ex << "[configuration error] term <" << className() << ">"
<< " requires <" << required << "> parameters";
throw Exception(ex.str(), FL_AT);
}
setCenter(Op::toScalar(values.at(0)));
setWidth(Op::toScalar(values.at(1)));
setSlope(Op::toScalar(values.at(2)));
if (values.size() > required)
setHeight(Op::toScalar(values.at(required)));
}
void Bell::setWidth(scalar a) {
this->_width = a;
}
scalar Bell::getWidth() const {
return this->_width;
}
void Bell::setSlope(scalar b) {
this->_slope = b;
}
scalar Bell::getSlope() const {
return this->_slope;
}
void Bell::setCenter(scalar c) {
this->_center = c;
}
scalar Bell::getCenter() const {
return this->_center;
}
Bell* Bell::clone() const {
return new Bell(*this);
}
Term* Bell::constructor() {
return new Bell;
}
}
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