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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/SigmoidProduct.h"
namespace fl {
SigmoidProduct::SigmoidProduct(const std::string& name,
scalar left, scalar rising,
scalar falling, scalar right, scalar height)
: Term(name, height), _left(left), _rising(rising), _falling(falling), _right(right) { }
SigmoidProduct::~SigmoidProduct() { }
std::string SigmoidProduct::className() const {
return "SigmoidProduct";
}
Complexity SigmoidProduct::complexity() const {
return Complexity().comparison(1).arithmetic(2 + 4 + 4).function(2);
}
scalar SigmoidProduct::membership(scalar x) const {
if (Op::isNaN(x)) return fl::nan;
const scalar a = 1.0 + std::exp(-_rising * (x - _left));
const scalar b = 1.0 + std::exp(-_falling * (x - _right));
return Term::_height * 1.0 / (a * b);
}
std::string SigmoidProduct::parameters() const {
return Op::join(4, " ", _left, _rising, _falling, _right) +
(not Op::isEq(getHeight(), 1.0) ? " " + Op::str(getHeight()) : "");
}
void SigmoidProduct::configure(const std::string& parameters) {
if (parameters.empty()) return;
std::vector<std::string> values = Op::split(parameters, " ");
std::size_t required = 4;
if (values.size() < required) {
std::ostringstream ex;
ex << "[configuration error] term <" << className() << ">"
<< " requires <" << required << "> parameters";
throw Exception(ex.str(), FL_AT);
}
setLeft(Op::toScalar(values.at(0)));
setRising(Op::toScalar(values.at(1)));
setFalling(Op::toScalar(values.at(2)));
setRight(Op::toScalar(values.at(3)));
if (values.size() > required)
setHeight(Op::toScalar(values.at(required)));
}
void SigmoidProduct::setRising(scalar risingSlope) {
this->_rising = risingSlope;
}
scalar SigmoidProduct::getRising() const {
return this->_rising;
}
void SigmoidProduct::setLeft(scalar leftInflection) {
this->_left = leftInflection;
}
scalar SigmoidProduct::getLeft() const {
return this->_left;
}
void SigmoidProduct::setRight(scalar rightInflection) {
this->_right = rightInflection;
}
scalar SigmoidProduct::getRight() const {
return this->_right;
}
void SigmoidProduct::setFalling(scalar fallingSlope) {
this->_falling = fallingSlope;
}
scalar SigmoidProduct::getFalling() const {
return this->_falling;
}
SigmoidProduct* SigmoidProduct::clone() const {
return new SigmoidProduct(*this);
}
Term* SigmoidProduct::constructor() {
return new SigmoidProduct;
}
}
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